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  #16  
Old 01-13-2006, 12:32 PM
Geezer
 
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Timing chain?

Will a 603 even 'turn over' if the timing chain is broken, or will a piston soon fetch up against a valve and lock the whole engine?
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  #17  
Old 01-13-2006, 12:49 PM
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JimH,

If the timing chain breaks or jumps only one tooth, one of the pistons will push against a valve and stop the engine from rotating. If enough force is applied, such as cranking the engine with the starter, the piston will cause the cam towers to break, and possibly bend a valve. If this happens when engine is running, more may be damaged.

Possibly after a while, the hydraulic valve lifter may leak down and then the engine will turn again.

P E H
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  #18  
Old 01-17-2006, 12:38 PM
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Thanks for the advice is the 603 interference?

That is really nice to get all the advice - ill look into the Vacume pump and if the crank is turning - its just been too cold- single digits- to work on the car.
Worst case

I have a cracked head, blown chain (not belt??), a loose (worn) engine, Bad piston and is the engine interference??

-It does crank but sounds 1/2 on off.
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  #19  
Old 01-17-2006, 01:54 PM
Surf-n-Turf
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Is there somewhere to buy new vac pumps? I have searched through alot of MB parts sites but can only find rebuild kits. Is rebuilding them enough of a preventative.
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  #20  
Old 01-17-2006, 02:09 PM
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Location: Milford, CT
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Afaik their are no rebuild kits for the 603's vac pump, you can rebuild the 617's pump but that is a different animal.


Any MB parts site worth its salt should have a 603 pump listed Fastlane, Rusty, Adsitco ect.
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  #21  
Old 01-17-2006, 02:21 PM
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Quote:
Originally Posted by biomerc
That is really nice to get all the advice - ill look into the Vacume pump and if the crank is turning - its just been too cold- single digits- to work on the car.
Worst case

I have a cracked head, blown chain (not belt??), a loose (worn) engine, Bad piston and is the engine interference??

-It does crank but sounds 1/2 on off.
The engine is definitely interference. In fact, I might take a stab and say that all M/B diesels are interference because of the very low chamber volumes.
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  #22  
Old 01-17-2006, 04:27 PM
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Quote:
Originally Posted by TimFreeh
The design of the pump was updated sometime in the 90's - I'm pretty sure (if your pump was replaced with a new one) that you now have the updated pump. If the front cover of your pump contains 4 torx screw heads you have the new version.
Just in case anyone was wondering, I checked, and do indeed have the newer pump on my car. Figured I would, but nice to verify it.
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  #23  
Old 01-17-2006, 04:30 PM
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i have a new vacuum pump on my car since its a nice new metal unlike the rest of the oily 20 year old grime coated block.. how do i tell its the good pump not the bad one
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  #24  
Old 01-17-2006, 08:54 PM
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Quote:
Originally Posted by TheDon
i have a new vacuum pump on my car since its a nice new metal unlike the rest of the oily 20 year old grime coated block.. how do i tell its the good pump not the bad one
You don't have to worry. The problem was with the 603 engines.
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