Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 08-25-2008, 11:17 AM
dieseldan44's Avatar
Registered User
 
Join Date: Nov 2006
Location: Boston
Posts: 2,035
Question Help me decide if I should go for a rebuilt head..(OM617)

Greetings,

From an earlier thread trying to diagnose some loud idling, hard starting and nailing ( Need help with nailing / knocking / hard starts).

I tested my compression and found it to be:

(after a valve adjustment)
#1: 380 psi
#2: 360 psi
#3: 370 psi
#4: 220 psi (260 psi after squirt of oil)
#5: 250 psi (260 psi after squirt of oil)

I would think this points to valve problems. I have two questions:

1.) Pending a leakdown test to verify it is the valves, should I go for a rebuilt head from Metric? Is that the thing to do?

2.) Am I hurting anything driving the car with those compression numbers? It currently needs 10+ seconds of glow to start on the first crank without any misses, does 25 mpg and drives just fine. This car goes off the road in November for the winter, Id like to wait until then.

Thanks,
dd
__________________
-------------------------------
'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car
Reply With Quote
  #2  
Old 08-25-2008, 11:55 AM
Alastair's Avatar
Registered User
 
Join Date: Mar 2002
Location: South Wales U.K.
Posts: 1,064
Personally I would do a proper leak-down test first before deciding anything....

A fully re-built head will cost a few pennies especially from Metric (from what I gather,-based in UK...) It would be a shame to find it doesn't completely cure your issues....

Yup, Good hot engine, and leak-down test is best way forward and what I would do--It will tell you exactly where the compression is being lost....
__________________
http://i190.photobucket.com/albums/z...0TDnoplate.jpg

Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 12:14 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page