|
|
|
#1
|
|||
|
|||
How to replace "Bypass Hose" for 1990 300 SEL
Is this a big job?
My bypass hose has a leak. I can't just replace the hose, it looks like I have to take somethings off such as the thermostat or the water pump. Does anyone know what I need to do? I have no idea why Mercedes engineers made this so difficult. Thanks, Matt
__________________
1990 Mercedes 300 SEL (320,000 miles) 1994 Mercedes E420 (140,000 miles) |
#2
|
|||
|
|||
You need to remove the waterpump to replace this hose.
Not a simple job but is doable - it's just time consuming and you need to have all the correct tools. There is a DIY on this in the resources section under DIY articles. |
#3
|
||||
|
||||
Been there done, that. It's not hard just time consuming. May as well replace the water pump while in there, any other hoses, new belt, and flush the system.
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#4
|
|||
|
|||
thank you.
This may sounds like a dum question though, what would be the harm to taking a hacksaw and cutting a 1/2 inch off the pipe that connects to the block? This would allow me replace the hose in 2 minutes. Is there any reason why the bypass hose has to be so short? Any reason why the thermostat is so close to that pipe? My hunch tells me that the reason why it is so close is because of the pressure from.the water pump may cause a leak if not so close.
__________________
1990 Mercedes 300 SEL (320,000 miles) 1994 Mercedes E420 (140,000 miles) |
#5
|
||||
|
||||
I doubt it generates enough pressure to rupture a hose. Its probably designed that close because the German engineers like to have metal between connections more than rubber. I'd leave it alone and repair it correctly. Hacksaw = metal particles into cooling system, not good.
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#6
|
||||
|
||||
Quote:
Don't know, let us know how it turns out.
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#7
|
|||
|
|||
Thanks.
My other thought that this is how mercedes gets people to go to the dealership for repair$.
__________________
1990 Mercedes 300 SEL (320,000 miles) 1994 Mercedes E420 (140,000 miles) |
#8
|
||||
|
||||
Well, it's bound to happen sometime...
Just about everyone here isn't the first, second, or even third owner of their cars. So knowing what has been done and what hasn't is an issue. You could be on your second one and second water pump. That's pretty good for over 300K.................
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#9
|
|||
|
|||
Quote:
AS the vehicle is nearly twenty years old, you should replace water pump, thermostat, tensioner, belts and hoses. (flush radiator) |
#10
|
||||
|
||||
I replaced it...
without removing the water pump in my 300e. Yes, I cut the hose and installed the new one through the gap. The secret is buying the hose from the dealer as it is more flexible than after market. You will need lubrication and a lot of patience but, it will get in there. Worse comes to worse, you will need to remove the water pump. By the way, if you need to cut the pipe, make sure it is on the water pump side.
Good luck!
__________________
J.H. '86 300E Last edited by J.HIDALGO; 04-26-2009 at 05:43 PM. |
#11
|
|||
|
|||
thanks.
by the way, why on the pump side? i was thinking of cutting the pipe on the block side. seems long enough.
__________________
1990 Mercedes 300 SEL (320,000 miles) 1994 Mercedes E420 (140,000 miles) |
#12
|
|||
|
|||
i second the line on replacing the water pump.....as you are replacing the hose.
i was out of town...and my wife started driving on a water pump that was weeping slightly she didn't notice.. cost me a water pump and a head gasket.... 2k. if i had been in town i could have done the water pump for 150 dollars... oh well.
__________________
1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k 1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC] |
#13
|
||||
|
||||
Pump side...
Worse comes to worse, you can replace the pump. You do not even need 1/2 inch, may be a 1/4 inch. Do a search...I am sure I posted something about it.
However, if you are keeping the car, buy a new pump.
__________________
J.H. '86 300E |
#14
|
||||
|
||||
Overall these are easy to work on, but some things are difficult, as with most other cars. I think they do it deliberately just to annoy people.
|
#15
|
|||
|
|||
Quote:
|
Bookmarks |
|
|