years ago I worked on starting a wrecked car for a used car dealer. Once I replaced the battery noticed engine had no compression and called the customer (used car dealer) and told him. He said "Listen the car had to been running when it was totaled thus the engine is good, so poor a little oil down the carburator as you crank it." Sure enough pooring oil down the carburator started the car and ran perfect. What happens is the rings get stuck in piston and will not build compression and the oil provides just enough sealing to force rings out. Since then I have used this trick many times, especially on hot washed rotary engines.
I once had an old mercedes (OM617) that "was running when parked 4 years ago," however I could not get it running. Finally I connected 24V to the starter and got it spinning fast enough to run and aftwards it started everytime like normal. Trampas On Mon, Mar 21, 2011 at 5:38 AM, Dieselhead <126die...@gmail.com> wrote: > Compression test on an engine that has been sitting is not reliable. any > carbon or rust in a valve/seat will keep that cyl from showing true > compression. If you turn it over by hand and listen, you should feel the > resistance of compression (and hear the leakdown) 5 times within two > revolutions of the crank. I use a 18" breakerbar on an engine out of the > car, and a good compression will be hard to pull through quickly with that. > In the car, I use a regular 1/2" rachet. The speed of turning is limited by > the leakdown rate. But again, IF the test shows a weak cyl, it may be only > from rust/carbon. If #1 is weak, then it likely IS a bad engine. #1 wears > out first. > > > > Well, the owner got smart and changed his mind when he found out what he >> was getting into, Says I can do it myself or send someone over to do a >> test. Car is minus its brakes so must stay put in his driveway. >> >> On Thu, Mar 17, 2011 at 9:22 PM, Russ Williams <rawil...@eatel.net> >> wrote: >> >> 8mm for the hold down nut and 12mm for the plug. >>> Gear wrenches for both or a 8mm swivel 1/4" socket for the nut. >>> >>> Russ W. >>> Who just replaced the GP's on the 300D. >>> >>> _____ >>> >>> From: mercedes-boun...@okiebenz.com [mailto: >>> mercedes-boun...@okiebenz.com] >>> On Behalf Of Rich Thomas >>> Sent: Thursday, March 17, 2011 5:26 PM >>> To: Mercedes Discussion List >>> Subject: Re: [MBZ] Time & $$s for a compression test >>> >>> >>> >>> Get a gear wrench, I think it is a 10mm that fits the GP wire nuts, and >>> put a little super magnet on the outside to hold the nut. >>> >>> --R >>> >>> On 3/17/2011 5:23 PM, Curt Raymond wrote: >>> > Remember the connections from the injectors to the IP are about as in >>> the >>> way as they can be. 190D is worse. >>> > Then the fact that the little electrical connections have to come off >>> first and they're VERY easy to drop aaaand you can't swing the wrench >>> all >>> that far. >>> >>> >>> >>> _______________________________________ >>> http://www.okiebenz.com >>> For new and used parts go to www.okiebenz.com >>> To search list archives http://www.okiebenz.com/archive/ >>> >>> To Unsubscribe or change delivery options go to: >>> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >>> >>> _______________________________________ >> http://www.okiebenz.com >> For new and used parts go to www.okiebenz.com >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> > > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
