1980 300TD buying ?s & oil preasure concerns. - Page 2 - PeachParts Mercedes-Benz Forum

#16 09-08-2007, 10:32 AM

Sorry, it appears the oil pump is less expensive for the NA 617, it's a completely different part (shaft driven, not chain driven):

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1CQ0J3JZ426C0MI5ZK&year=1980&make=MB&model=300-TD-001&category=All&part=Oil+Pump

pawoSD · #17 09-09-2007, 12:12 AM

I replaced my oil sender today, the old one was on so loose that when I put my wrench on it it came loose by merely pulling at it with one finger!

is it supposed to be that loose? I put the new one on much tighter....not super tight, but good and snug. No leaks. And indeed did it make a difference. Started the car, pressure jumped right up to 3bar, idles warm now at 2bar, just like it did when I got the car. Lately it had been showing 0 to half a bar at idle, and wouldn't get to 3bar unless I rev'd it over 2000rpm. Now it jumps immediately, and the gauge is smooth like it should be. Very pleased with the results and I like knowing my engine has excellent pressure.

JimmyL · #18 09-09-2007, 12:45 AM

Here's a dumb question: Where is the oil sender? Pic anyone?

lietuviai · #19 09-09-2007, 12:47 AM

How do you know the car actually only has 178K. These odometers are notorious for slipping and stopping. Is there any way to verify the mileage?
My newly aquired engine with 144K on it idles at nearly 2.5 bar when fully warmed up but it is a turbo engine.

300SDog · #20 09-09-2007, 01:39 AM

How old is bottle in the trunk? QS used to be the best because it was Pennsylvania crude, same as Pennzoil was and Wolf's head before PA drilling operations shut down. Reputed to be finest oil in the planet.

Otherwise test drive it from stone cold start if yer lookin at it tomorrow. And ask the seller to start the car while you first listen under the hood to hear the engine kick then sniff smoke out the back. Heat it up on expressway at full throttle then see if oil pressure drops when slowin down on exit ramp. If it does, NOT a good sign. And when idling warm the needle oughta peg fast when you hit the pedal.

How much they askin for this old wagon?

pawoSD · #21 09-09-2007, 02:54 AM

Quote:

Originally Posted by JimmyL

Here's a dumb question: Where is the oil sender? Pic anyone?

Actually my post was kinda irrelevant to the W123....as its mechanical....but on the high tech 126 we get an electrical oil pressure sensor.

Its on the back of the oil filter canister at the bottom.

Whiskeydan · #22 09-09-2007, 09:41 AM

What would you pay for this one?

Odometer stopped at 248K, maybe has 300k now. Black int is in good shape. Drives nice, some rust around the door bottoms, below rear window.
AC 'needs charge'

...
Its sluggish but shifted and handled well when I test drove it.

AMG wheels are from a W208, I believe.

tobybul · #23 09-09-2007, 10:31 AM

Quote:

Originally Posted by Whiskeydan

What would you pay for this one?

Odometer stopped at 248K, maybe has 300k now. Black int is in good shape. Drives nice, some rust around the door bottoms, below rear window.
AC 'needs charge'

...
Its sluggish but shifted and handled well when I test drove it.

AMG wheels are from a W208, I believe.

IMO, I would start at bet $800-$1200 but no more than $1500 due to mileage.... there could be other surprises

JimmyL · #24 09-09-2007, 02:34 PM

Quote:

Originally Posted by tobybul

IMO, I would start at bet $800-$1200 but no more than $1500 due to mileage.... there could be other surprises

Not what you wanted to hear, eh Danno?

Tell that guy to quit over-valuing his wagon and sell it to you!

JimmyL · #25 09-09-2007, 02:37 PM

Quote:

Originally Posted by pawoSD

Actually my post was kinda irrelevant to the W123....as its mechanical....but on the high tech 126 we get an electrical oil pressure sensor.

Its on the back of the oil filter canister at the bottom.

Ahhhh, gotcha. Thanks for the clarification. See, sounds like I need a W126 so I won't have questions like that.....

Whiskeydan · #26 09-09-2007, 09:37 PM

Quote:

Originally Posted by tobybul

IMO, I would start at bet $800-$1200 but no more than $1500 due to mileage.... there could be other surprises

I guess he's not wanting to sell then.

I really like the color combo.

t walgamuth · #27 09-10-2007, 05:25 AM

Quote:

Originally Posted by JimmyL

Here's a dumb question: Where is the oil sender? Pic anyone?

It is a mechanical guage with a plastic tube from the filter housing to the guage in your dash.

I have never seen a ten w forty oil that is diesel rated.

I think your motor is probably fine.

The na diesel three hundreds are not as fast as the turbo but they are fast enough imho. And the engines if cared for about cannot be worn out.

Tom W

rrorison · #28 09-10-2007, 02:11 PM

I bought the car. $2700

It came with a maintenance stamp book stamped by dealers or German auto shops from it origin until 11/2001 135k miles. No stamps after that. Removing the oil filler cap while running was uneventful. It just sat there barely moving. Removing it produced a little smoke exiting from the hole on a regular basis.

The interior of the car is flawless except for carpet stains and worn fabric on the door pillars. I am not sure if anyone has ever sat in the back seat. There was a wrapped lollipop under it so maybe someone had. Only bad was PO was a smoker leaving a faint smell.

The exterior is rustproof except for a thumbnail sized spot on the underside of the rear hatch door. Original paint will look beautiful with a little buffing with only a couple of rocks chips as damage.

PO lived in CA and had 5 MBs including a 6.9. This was the last the son was selling. The PO is an American that lives in Germany 6 months a year. I bought it from his son.

I hope I will not regret the following. The oil pressure was actually lower than I expected. At warm idle it sits at 1. Hwy speeds it sits just a tad over 2. I changed oil and filter in the guy's driveway before I drove the car home. Oil pressure did not change. I drove it 230 miles home the way it was. It will sit until I can figure out what is wrong.

Following are a few other issues I will address after I first try and find the answers that might already be on the board. If not, then I will address them individually as posts.

1.Oil pressure

2.Shifting issues : Shifter seems misaligned with the shifter having to be a little farther back than the notch for the transmission to engage. The transmission will only up shift after you pull you foot off the pedal. I have experienced this before in a car with a vacuum problem. I hope it is that or linkage. It down shifts with no problem. Driving in traffic is a pain because it is constantly down shifting right after I get it to up shift.

3.Drivers side door will not lock/unlock with key. Looks like someone tried to pick the lock.

4.SLS system does not seem to work properly.

2.5Turbo · #29 09-10-2007, 05:08 PM

Yeah, that's not too good. The oil pressure needs to be pegged at 3 at highway speeds (2500+RPM).

Warm idle is OK, but the high speed numbers are not. I might look into the oil pump if we're sure the gauge is OK.

Alberta Luthier · #30 09-10-2007, 05:38 PM

Some members have found that by changing the tiny O-rings, cleaning out the little holes on the oil filter cover stem, and blowing out the crud in there they suddening improved their oil pressure. How or why this worked is not something I understand but it's easy and worth a try.
Go to:
Low oil pressure at idle..... changed o rings

and read down from about #10 or #11 past #24 or so
good luck