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Old 05-03-2008, 12:25 AM
Phoenix, AZ
Join Date: Mar 2008
Posts: 16
No compression 5 thru 8

1985 380SE 126 116.963 3.8L V8.
Started with a no start issue check all the relays ect.
did a compression test today and 1 thru 4 were all at 121 or 122.
5 thru 8 have 0 lbs. The needle does not even flicker.
I havnt taken of the valve cover yet kindof afraid of what it may look like.
Does this sound like a head gasket or maybe the cam on drivers side?
I have no idea what to expect. any help is much appreciated
Thanks again for your time and for sharing your knowledge.
This site ROCKS!!!


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Old 05-03-2008, 08:40 AM
Registered User
Join Date: Jan 2003
Location: Matthews, NC
Posts: 1,356
Timing chain jumped. Now may have bent valves.
Sorry to be the one to say this.
84 500 SEL (307,xxx miles)
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Old 05-03-2008, 09:14 AM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 36,897

Valves open are the only way to get zeros.


Tom W
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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Old 05-03-2008, 02:34 PM
jhodg5ck's Avatar
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Join Date: Feb 2004
Location: Atlanta, GA
Posts: 1,405
Expect to lay out a good bit of $$ to fix it properly...likely more then the car is worth unless it's in pristine condition otherwise :-/

Were I in your shoes I'd start looking for a Euro 500 drive line to drop in.

Blue Ridge Mercedes
Jonathan Hodgman
Enthusiast Service, Restoration & Tuning.
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Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
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Old 05-03-2008, 04:29 PM
Registered User
Join Date: Aug 2003
Location: Phoenix
Posts: 3,726
Valve damage is going to cause a certain amount of comotion and calamity from metal hitting metal. If you didn't have that you may not have a ruined engine. A jumped timing chain doesn't necessarily ruin an engine.

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