240D engine

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240D engine

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240D engine - 10/30/2005 9:55:44 PM

Posts: 9
Joined: 9/12/2005
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My '81 240D has 238K miles on the original engine. When starting, it blows blue smoke for a few minutes until some heat builds up, then goes away.
I've taken a compression test (after it has warmed up) and the cylinders register from 350-410 PSI (24.5-28.5 bar). I have not adjusted the valves yet. I bought the car about 2 months ago and don't have previous service records. There is also a lot of blow by when I undo the oil cap too.

From the research that I've done, the compression seems to be OK?

Does this sound like a valve seal problem? And if so, can the valves be remedied without pulling the head off the motor? And are there any special tools needed to service the valves for this problem?

Thanks,
Andy

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1981 240D
4cyl
4spd

Post #: 1

RE: 240D engine - 10/31/2005 12:57:52 AM

Kajtek1

Posts: 772
Joined: 9/29/2004
From: Bay Area CA
Status: offline

The compressions looks OK, but not great.
Engine purge would be the first thing I would do.
Valve adjustment never hurts, although I don't think some misadjustement would cost excessive smoking.

(in reply to AJ)

Post #: 2

RE: 240D engine - 10/31/2005 8:13:58 AM

timberfield

Posts: 71
Joined: 8/9/2005
Status: offline

Sounds to me like a leaky injector....

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83 240D 130K
85 300SD 310K
84 300SD 131K

(in reply to AJ)

Post #: 3

RE: 240D engine - 10/31/2005 9:01:17 AM

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I thought BLACK smoke was an indicator of FUEL/injector problems? Mine is BLUE smoke, which to my understanding is OIL burning?

Andy

_____________________________

1981 240D
4cyl
4spd

(in reply to timberfield)

Post #: 4

RE: 240D engine - 11/1/2005 7:10:17 AM

timberfield

Posts: 71
Joined: 8/9/2005
Status: offline

It can look BLUE if it is un-burned fuel. Sometimes the injectors will bleed down overnight causing excess fuel in the cylinder. When you startup it will smoke like crazy. I don't know how to check it other than smelling it.

_____________________________

83 240D 130K
85 300SD 310K
84 300SD 131K

(in reply to AJ)

Post #: 5

RE: 240D engine - 7/10/2006 1:30:06 PM

Higgins11

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Joined: 7/10/2006
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stupid question from a stupid newbie

what to you mean about a engine purge?

purge the fuel lines at the injectors??

if so what would this help

Thanks

Higgins

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1983 240D

(in reply to Kajtek1)

Post #: 6

RE: 240D engine - 7/30/2006 6:23:27 PM

Drrty240D

Posts: 154
Joined: 7/30/2006
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quote:

ORIGINAL: AJ

My '81 240D has 238K miles on the original engine. When starting, it blows blue smoke for a few minutes until some heat builds up, then goes away.
I've taken a compression test (after it has warmed up) ......?

Thanks,
Andy

I had a similar issue with my '82 240 until I replaced my glowplugs. The new glowplug kit (Bosch) came with an updated version of the glowplug relay which heats the system for a longer time before cranking, then keeps the plugs lit for a short while after the engine has fired to help reduce fuel smoking. Solved my problem nicely. Might be worth a try if it's been a while since you serviced your glowplug system, and it certainly beats tearing your engine apart. Good luck.

(in reply to AJ)

Post #: 7

RE: 240D engine - 7/31/2006 1:32:24 AM

duxdevil

Posts: 185
Joined: 2/20/2006
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defeinately a fuel supply problem.

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(in reply to Drrty240D)

Post #: 8

RE: 240D engine - 8/14/2006 12:37:31 PM

hughowens

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Joined: 4/30/2006
Status: offline

purge refers to using chemical solvents to try to clean up the pump, injectors etc. look at dieselgiant.com for more info. regards, hugh

(in reply to Higgins11)

Post #: 9