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  #61  
Old 10-01-2013, 11:50 AM
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And now that I've invested 10 minutes in reading 4 pages of forum, what was the end result on the 240d?
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  #62  
Old 11-10-2013, 11:33 PM
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Quote:
Originally Posted by petecooke View Post
I have a 1983 240d with zero compression on the #3 cylinder. Car has about 200k miles. All the other cylinder messure between 340-400 compression.
I pulled the motor about 6 months ago and it's been sitting in my garage since then.

I squirted some oil in the #3 cylinder and the compression instantly jumped to over 300 psi so I assumed I had bad rings/piston/cylinder.

Yesterday, I pull the valve cover and set the cam so that there was valve clearance between both the intake and exhaust valves. I assume by doing this both valves would be seated tightly and there would not be any air coming out of the intake or exhaust ports.

After doing the above, I shot forced air into the injector port and all the air came out the intake port. I did the same thing to the other cylinders and the cam/engine rotated as should happen if the valves were seated.

Now I think the problem has always been with the intake valve on #3.

The questions I have are the following:

Why would squirting oil in the #3 cylinder cause the compression to go to over 300 if the intake valve is stuck open?

Is it possible to fix this problem without removing the head?

Will a machine shop need to rebuild the head or is this something I would be able to handle with the proper tools? I do have many tools/gauges but not a commercial press.

What should be my next step in resolving this problem?

Thanks for any advise.

pete
What was the final outcome for this vehicle?

.
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1973 300D
1973 309D - stolen
1978 280SE
1980 240D
1983 300D
1984 190D
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  #63  
Old 01-18-2014, 02:09 PM
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Any update

on how this is going ?


.
__________________
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asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Prototype Vehicle build.
Prototype Fleet Durability
Prototype vehicle instrumentation.
Technical Quality Auditor.
Automotive Technical Writer

1973 300D
1973 309D - stolen
1978 280SE
1980 240D
1983 300D
1984 190D
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  #64  
Old 01-28-2014, 10:25 AM
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Posts: 248
I had a few bad valves that weren't seating perfectly. They were replaced along with all the valve stem seals. I also had the cylinders checked and they were fine. The engine is back together and running strong.

It was a serious learning experience.

Thanks for all the help.

pete
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  #65  
Old 01-28-2014, 10:41 AM
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Hmm

Quote:
Originally Posted by petecooke View Post
I had a few bad valves that weren't seating perfectly. They were replaced along with all the valve stem seals. I also had the cylinders checked and they were fine. The engine is back together and running strong.

It was a serious learning experience.

Thanks for all the help.

pete
I assume they also replaced the valve guides ?

.
__________________
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asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Prototype Vehicle build.
Prototype Fleet Durability
Prototype vehicle instrumentation.
Technical Quality Auditor.
Automotive Technical Writer

1973 300D
1973 309D - stolen
1978 280SE
1980 240D
1983 300D
1984 190D
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  #66  
Old 01-28-2014, 10:51 AM
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Yes
The valve guides were replaced also.
The head looked beautiful when I received it from the machine shop.
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  #67  
Old 01-28-2014, 11:20 AM
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Fantastic

Thanks for the closure on this thread..

.
__________________
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asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Prototype Vehicle build.
Prototype Fleet Durability
Prototype vehicle instrumentation.
Technical Quality Auditor.
Automotive Technical Writer

1973 300D
1973 309D - stolen
1978 280SE
1980 240D
1983 300D
1984 190D
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