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  #1  
Old 02-08-2007, 09:44 AM
vstech's Avatar
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OK silly question I think...should the hose build any pressure?

I think I know this, but I wanted to run it past you guys first.
I get no pressure build up on drives. the temp stays rock steady at 80C now since I flushed and refilled, but I get no pressure.
I can find no leak, I do not lose any fluid, and I have the correct G-05 coolant in there. (weird using clear coolant...I wish they had put some color in it )I am guessing the rad cap is loosing pressure, but I am not sure, I have a pressure test kit, so, I will go to town on the sucker soon.
so am I a complete idiot? there Should be pressure right?
I put the overflow tube into a G-05 Bottle and I will monitor if coolant is getting blown out the tube...
John

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #2  
Old 02-08-2007, 10:12 AM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
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Yes, you should have pressure built up especially after a drive. Do the pressure test. It sounds like the cap is either weak or not sealing.
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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K
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  #3  
Old 02-08-2007, 10:50 AM
vstech's Avatar
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thanks RR, it's what I figured, but I was asking due to the messages I read about pressure in a hose showing blown head gasket, and I wanted to be 100% sure of if with you guys... I know DUH!
Thanks,
John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #4  
Old 02-08-2007, 11:01 AM
sailor15015's Avatar
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When my temps stay around 80C I don't get that much pressure, like I can squeeze the upper hose nearly all the way together when I pinch it. When it gets up around 100C plus, the hose is solid and I can't squeeze it even with both hands.
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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo
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  #5  
Old 02-08-2007, 11:16 AM
rrgrassi's Avatar
mmmmmm Diesel...
 
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Quote:
Originally Posted by vstech View Post
thanks RR, it's what I figured, but I was asking due to the messages I read about pressure in a hose showing blown head gasket, and I wanted to be 100% sure of if with you guys... I know DUH!
Thanks,
John
Pressure when the engine is cold can be a sign of a blown head gasket. Never hurts to check, though.
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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K
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  #6  
Old 02-08-2007, 10:54 PM
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OK, good news, I found the problem with no pressure. the metal under the seal on the cap was cracked. I figure " no problem, I'll just go pull a cap off one of my parts cars" right? ... um, no.
Ok, I look at the cap on my SD, it's a 140KPS, the one on my SD parts car is similarly cracked, so I go to the 83 TD, cool, it's not cracked, but it's only a 100Kps, hmm, I put it on, but it does not help build pressure, I figure the seal must be too old to work. off to the store to get a new one... of course they don't stock any german ones, but they have a universal in the correct pressure according to their book. 13psi... that is only 85 kps... what was on my car? 140... that's 22PSI, so I take out my trusty Snap on coolant pressure tester, to see if there are any leaks in the system, I find the tiny line to the expansion tank is leaking a bit, so I trim off a little of it, and replace the hose clamp. pump it up again, and it holds 15 psi fine, so I pump it up to 22 psi = to 140KPS and I hear some leaking... I shine the light around and trace the leak...
wait for it...
the lower tank on the radiator is leaking around the seal. :fork_off: why me? So, back to the parts cars... pump up the SD... seal leaks around the Top of the tank... go to the TD, I think it is not leaking, but the Tstat housing gasket is bubbling out pressure too fast to hold pressure long enough to verify... I don't wanna change the gasket on a parts car just to check the possibility of having a parts car radiator with god only knows when it will quit... NOBODY stocks a bher radiator, and the "universal" that they claim will fit my car is still 200.00 at pep boys... fiddlesticks. I put on the 13 psi cap, and drive around a while, pressure builds. hooray. but now of course, the leaking radiator will loose coolant... so,
1. what pressure cap is SUPPOSED to be on a 82 300SD W126 car? 140KP? 100KP? 13Psi?
2. did I damage my radiator by pumping the system up to 22Psi?
3. how common is it to have the SEAL fail on the tank? I thought the tank would fall apart before the seal would fail...
4. Should I just order a new radiator from phil/whunter?
5. What is a good low cost replacement radiator that you guys Trust?
6. does ANYBODY make a all copper/all aluminum radiator that won't do the stupid seal failure syndrome?
thanks,
John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #7  
Old 02-08-2007, 11:04 PM
vstech's Avatar
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according to the "buy parts" link, 1.4 bar/140Kps is right

soo... the parts stores have idiots stocking the shelves... and programming their computer.
but a working 13psi cap is better than a bad 140kps.
now, I know i didn't kill the radiator with too much pressure, but I still have a bad radiator.
heh, should I put in the copper/brass new radiator I have from my 67 firebird? THAT will not have a seal leak problem. and I think a 400HP gasser radiator probably can handle the heat of a 120HP Diesel... but I doubt it would fit.
I will patiently await your sage advice, oh forum of the helpfull star.
John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #8  
Old 02-09-2007, 01:12 PM
vstech's Avatar
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anybody? I seem to remember a post on here about a solid aluminum replacement radiator. anybody know where it is? I HATE the stupid plastic reservoirs on these stupid radiators. someone tell me there is a good aftermarket replacement... preferably with brass/copper tanks.
thanks,
John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #9  
Old 02-09-2007, 01:54 PM
vstech's Avatar
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WOW, I looked over the radiator cap, sorry, expansion tank cap... anyway, the thing is busted to pieces! both the lower part where the seal sits is cracked all over, and the upper part that sits against the top of the cap is shattered! I mean wow, I have never seen a radiator cap so badly destroyed. the rubber is nice and soft, no cracks and it looks great. but the brass parts of the cap are just destroyed! so in the future when looking for possible problems with a radiator cap, look over the metal parts well. I will post pictures if I can get a good enough close up of the damage...
the stant cheapo's are looking MUCH better than the german OEM replacements.
John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #10  
Old 02-09-2007, 02:21 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,177
Yeah, whoever came up with the plastic ends on a radiator needs to be taken out back and shot. It seems like engineered failure just so you have to buy parts, huh? Sort of like planned obsolescence.
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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K
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  #11  
Old 02-09-2007, 10:39 PM
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It my quest to find my headgasket issue a while back I tried a few different radiator caps to see if it made any difference at all. I tried 7, 13, 16psi caps, the universal kind and also an old 100kps and new 120 and 140kps german caps. No difference with any of them. I am running the 13psi cap now. Runs fine, no overheating, etc.

The main reason for pressurizing the cooling system is to increase the boiling point of the coolant. IIRC, 15psi coolant boils at 265*F? That is a large increase and a nice wide margin of error/extra capacity when running the engine at 190*F. So at 13psi I don't have quite the safety cushion the a 140kpa (22psi) cap would provide. I also don't have the extra stress of 22psi on the multitude of old parts in the cooling system. Why stress things if you don't need to?

RT
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  #12  
Old 02-09-2007, 10:43 PM
sailor15015's Avatar
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FYI, if you do have to get a new radiator, there's a shop in New York City that sells Nissens radiators on ebay for about $135, free shipping. That's where I got the new radiator for my '84. Works like a charm.
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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo
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  #13  
Old 02-10-2007, 08:08 AM
vstech's Avatar
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Quote:
Originally Posted by sailor15015 View Post
FYI, if you do have to get a new radiator, there's a shop in New York City that sells Nissens radiators on ebay for about $135, free shipping. That's where I got the new radiator for my '84. Works like a charm.
ya got a link? or a name for the shop? best price I found on ebay was 195 plus shipping...
thanks,
John
a bit more searching, turned up 190.50 free shipping from a NY seller, perhaps the costs went up since last you looked.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=019&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=290080640128&rd=1,1
incase someone needs this info after the auction closes... http://myworld.ebay.com/ebaymotors/euro-parts-direct/ is the seller,
John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Last edited by vstech; 02-10-2007 at 10:39 AM.
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  #14  
Old 03-08-2007, 11:18 PM
vstech's Avatar
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Well I pulled the radiator out of my 83 TD and installed it into the SD, it sure is tighter in the TD... anyway, seems to be holding pressure well. pumped it up to 22psi and let it sit for 10 minutes, no leaks! yeay! drove around for 20 minutes and it built up heat and pressure great. nice and hard. I have it a little over filled, to be sure all the nooks and crannies get enough coolant.
I noticed the 82 SD has a solid aluminum fan, and the 83 TD and SD have a plastic fan on an aluminum hub. which fan is best? (I am actually thinking of removing the fan altogether and installing an electric fan) I am impressed and annoyed at the same time after removing the fan on these cars. impressed that they make it possible to get the tiny bolts that hold the fan hub to the pulley with the slots in the hub. very nice that it holds the bolts for you so unlike a chevy... I however hate the tiny heads on the bolts. too close to get a box end wrench on. open end wrenches are insufficient for proper gripping of the head. I will invest in a snap-on or MAC open end for this in the future, I rounded the corners on three of the bolts, but did get them all off.
I put the original all metal blade back on, cause I didn't want to put the gunky greasy one from the TD, and I didn't want to bollic up the bolts on the SD parts car.
Check out the damage on my original radiator cap...
Looks good at first glance...

However upon close inspection I noticed these cracks in the upper seal support

and upon even further inspection I found the thin brass shim that holds the large lower seal on looks like this.

and this
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #15  
Old 03-08-2007, 11:23 PM
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