diesel compression tester advice - Page 2 - PeachParts Mercedes-Benz Forum

barry12345 · #16 12-22-2013, 09:22 PM

Quote:

Originally Posted by earl orchard

i had the stop lever down, do i need to do something else to stop the fuel from going thru the injectors? does having fuel go thru the injectors affect the compression check?

If all cylinders are open no. If only one is being checked the engine might start. It is better to have the fuel off to avoid the misting coming out of the cylinders anyways.

whunter · #17 12-23-2013, 02:58 AM

Quote:

Originally Posted by earl orchard

Hi all
has anyone bought/used the diesel compression tester from harbor freight?http://www.harborfreight.com/12-piece-diesel-engine-compression-tester-93644.html(i think i have a bad head gasket)
i have a om602 engine in a 92 124 and was wondering if this tester is worth the time/money to get and if so does it come with the right adapter for use with my engine, the guy in Washington state has one for about double the price,but i don't think his comes with the right adapter for use in my engine.
i also checked around for one to rent or borrow,and no luck(including here at peachparts)
any thoughts?

I assume this is the Turbo OM602..

What are the symptoms that make you suspect a bad cylinder head gasket?

FYI:
The OM602 turbo cylinder head is not forgiving if the gasket is failing.
If you are 50% sure, replace the head gasket without further diagnosis.

.

ichris93 · #18 12-23-2013, 09:21 AM

Quote:

Originally Posted by whunter

I assume this is the Turbo OM602..

What are the symptoms that make you suspect a bad cylinder head gasket?

FYI:
The OM602 turbo cylinder head is not forgiving if the gasket is failing.
If you are 50% sure, replace the head gasket without further diagnosis.

.

What do you mean it is not forgiving?

Mölyapina · #19 12-23-2013, 09:34 AM

Quote:

Originally Posted by ichris93

What do you mean it is not forgiving?

That it will warp/crack fairly easily, I would assume.

ichris93 · #20 12-23-2013, 10:00 AM

Quote:

Originally Posted by Jooseppi Luna

That it will warp/crack fairly easily, I would assume.

Does this happen if you drive it with a failing head gasket?

earl orchard · #21 12-23-2013, 10:55 AM

HI hunter
i think it has a bad headgasket because it was running quite hot and was losing coolant, lots of white smoke and when i did the compression check ant-freeze came out of the glow plug hole,i would think anti-freeze in there would indicate at least a bad gasket ? anyway i think this might have started when my radiator neck broke and i lost a lot of coolant and the engine got a little hot, i did shut if off before it got into the red. and when this latest problem started which was about 2 months later and i noticed it was getting hot i shut the car off before it got real hot and have not driven it since. i have already started to pull the head, i have the intake off, radiator out,belt tensioner, and the air inlet for the turbo off( a bunch of oil came out of the turbo,is that normal?

funola · #22 12-23-2013, 11:41 AM

Quote:

Originally Posted by earl orchard

HI hunter
i think it has a bad headgasket because it was running quite hot and was losing coolant, lots of white smoke and when i did the compression check ant-freeze came out of the glow plug hole,i would think anti-freeze in there would indicate at least a bad gasket ? anyway i think this might have started when my radiator neck broke and i lost a lot of coolant and the engine got a little hot, i did shut if off before it got into the red. and when this latest problem started which was about 2 months later and i noticed it was getting hot i shut the car off before it got real hot and have not driven it since. i have already started to pull the head, i have the intake off, radiator out,belt tensioner, and the air inlet for the turbo off( a bunch of oil came out of the turbo,is that normal?

Does your car have a coolant level sensor warning and was it working? If so and you saw the warning in time it could have saved the head.

whunter · #23 12-23-2013, 11:45 AM

Quote:

Originally Posted by ichris93

Does this happen if you drive it with a failing head gasket?

This causes odd heat stress = accelerates/increases the odds of cracking the aluminum head by several orders of magnitude.

.

whunter · #24 12-23-2013, 12:05 PM

Quote:

Originally Posted by earl orchard

HI hunter
i think it has a bad head gasket because it was running quite hot and was losing coolant, lots of white smoke and when i did the compression check ant-freeze came out of the glow plug hole, i would think anti-freeze in there would indicate at least a bad gasket ?

anyway i think this might have started when my radiator neck broke and i lost a lot of coolant and the engine got a little hot, i did shut if off before it got into the red. and when this latest problem started which was about 2 months later and i noticed it was getting hot i shut the car off before it got real hot and have not driven it since. i have already started to pull the head, i have the intake off, radiator out,belt tensioner, and the air inlet for the turbo off( a bunch of oil came out of the turbo,is that normal?

There is no doubt you have a major issue...

IMO; The only possible debate at this point is:

* Bad head gasket.
* Cracked cylinder head.

Both of these require cylinder head removal.

As for the turbo, I suggest you read and look at the pictures in this thread.
http://www.peachparts.com/shopforum/diesel-discussion/324783-1992-300d-2-5-vacuum-pump-failure-ball-bearings-fell-into-timing-chain.html

Each
http://www.peachparts.com/shopforum/3255555-post99.html

of
http://www.peachparts.com/shopforum/3255918-post103.html

these
http://www.peachparts.com/shopforum/3256894-post105.html

links
http://www.peachparts.com/shopforum/3258124-post109.html

are
http://www.peachparts.com/shopforum/3259385-post112.html

on point for your turbo question.

.

earl orchard · #25 12-23-2013, 12:14 PM

i an not sure if it has a coolant sensor or not i only drove this car for about 3 months before all this happened, i dont remember seeing anything light up on the dash,just the temp gauge going up and then i pulled over and shut it off

earl orchard · #26 12-23-2013, 01:50 PM

hi hunter
so do you think i could have had a turbo bearing/seal failure that led to me blowing my head gasket/cracking my head? does it look like the oil is coming from the turbo into the intake? should i now remove my turbo from the car?

zorecati · #27 12-23-2013, 02:41 PM

Quote:

Originally Posted by earl orchard

hi hunter
so do you think i could have had a turbo bearing/seal failure that led to me blowing my head gasket/cracking my head? does it look like the oil is coming from the turbo into the intake? should i now remove my turbo from the car?

That could oil coming from the breather in the valve cover. If an oil seal failed on a turbo, you could be sucking in oil which could cause the turbo to run away if the leak was bad enough.

whunter · #28 12-23-2013, 10:55 PM

Quote:

Originally Posted by earl orchard

hi hunter
so do you think i could have had a turbo bearing/seal failure that led to me blowing my head gasket/cracking my head? does it look like the oil is coming from the turbo into the intake? should i now remove my turbo from the car?

Re-write it to say a turbo bearing/seal failure may have been a major contributing factor, resulting in a blown head gasket and/or possible crack ed cylinder head.

Sorry, I can't verify possible oil leaks from pictures of your turbo = bench testing needed.

I would remove the turbo for bench testing.
Check with local heavy truck shops to find out where they send their turbos for test / repair.

.