Marco hat geschrieben:I’m wondering how much different can be warm engine vs cold, but yes he said he has another manometer for these tests and he doesn’t know the accuracy of the first he used… but I suppose we are not moving far from 1/1,5 max bar of differences, plus or even less. Let’s see.
Chain job:
Meanwhile I’ll pass in Mercedes to order new chain I think this is at least not a complicated job, replacing the chain only, assuming they sell it, only Febi is on the market as alternative….can you please revert to following points from my afternoon’s reply:
never change what is working in a 40 years old Mercedes unless it's broken, so do you suggest together with the chain to replace also the 3 guide rails and the tensioning rail? They are hidden by the timing case cover? I'd avoid to mess with a lot of things that are not leaking now, once for all the water pump but not limited to …
Please have a look to the picture of the chain tensioner I think is the correct type, why not in a factory repaired engine in 92 when they had this component redesigned already from some years. Can I keep it?
Hi Marco,
All I wrote is correct, don´t exchange parts that are only dirty (clean them) and don´t believe FIAT mechanics because it is Mercedes of 80s so HIGH QUALITY who listen to noise of silent chain
Never exchange any part if you haven´t MEASURE proven it is worn or defect is my ADVICE. But is your car you do it like you think is OK for you...
I KNOW LOT OF PEOPLE exchanged Original Part without a reaseon, throw money in WC and at end CRY as new part soon broke leaving them in the middle of nowhere...
About chain exchange, it is possible to do without removing cylinder head just break old chain, connect new with old and turn engine by hand for new chain to go inside engine and come out
Than reconnect with new pin and it is done. Of course BEFORE starting the engine check all three timing marks are in correct positions, because chain can go out of sync during process. IS VERY IMPORTANT !!!
At 80.000 km guides are still like new IMO. In my experience also at 200.000, maybe at 300.000 they need exchange.
Guides is hard plastic over aluminum and that plastic gets worn from time and mileage. But nothing you should worry about as it is quality material and lives in lots of oil. Also when valve cover is removed mechanic will se how much it is worn - new is straight surface and from mileage chain make path in plastic, if path is too deep it needs exchange and it is done trough front cover again engine is not opened (head removed)
Like said above Mercedes chain has tensioner, plastic guides and therefore it is silent, not Fiat like my car when I was 18 which rattles new, rattles old and mechanics tell difference by noise
They must be magicians
Like I told you, do important things chain, oil, spark plugs and just relax. Drive car as much as you can (when you are back home) and try to learn soul of that car
Enjoy your car, it is meanwhile old lady is not so important max speed or Dynojet. I mean you had luck driving 240kmh with old chain, if it broke at that moment you would need new engine like previous owner did.
About compression test you dont need to worry about spark plugs as mechanic should remove all 4 before the test, just remove FPR as fuel washes oil from cylinders and oil means compression
And measuring instrument you wrote is no problem if it is wrong 1 - 1,5 Bar - BELIEVE ME IT IS PROBLEM IF IT MISSES 0,1 BAR because after "measuring" you will have wrong results.
And wrong results you will compare with WIS values? And what can you decide then - ABSOLUTELY NOTHING...
REMEMBER
every measuring instrument needs to be accurate (up to its specification, normaly half a degree on its scale) othwerise it is just a TOY not an instrument
PS about engine part No. I think from description above it is not ECE engine but ask Mercedes dealership to check your invoice and try to find out what engine was installed in 1992 based on engine No.
From outside all 2.3 16 blocks are the same - there is not LONG block and SHORT block.
Short block means at Mercedes to BUY LOWER ENGINE ONLY with pistons
BUT WITHOUT CYLINDER HEAD which means your cylinder head is old and has now 300.000+ km
Bye,
Nikola.