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+--- Thread: Om603 Low Compression (/showthread.php?tid=7249)
Om603 Low Compression - av3ntador - 06-07-2016
So I've done a compression test on my OM603 and I've found that it has low compression. Cylinder 1 has 160 PSI and cylinder 6 has 260 PSI, the rest are somewhere in between.
Now, what are my options? I still want to make this car a superturbodiesel build and make some serious power.
I know I'd have to think about getting another engine or completely overhauling the current one. Overhauling it doesn't seem like such a bad idea to me. I wanted to put forged internals in it anyway. Anyone have any other suggestions?
RE: Om603 Low Compression - starynovy - 06-07-2016
Take it apart and decide. It can be cheap like leaking valves or expensive like worn out cylinders.
RE: Om603 Low Compression - barrote - 06-08-2016
use it til it dies ,
somewhere in the line it will go below 10bar and then start to smoke and misfire. then u need to rebuild it cause u can´t do nothing else ...
and by the way something is very wrong there, usually is the 6th cylinder wich starts to complain...
good luck whaever u decide.
RE: Om603 Low Compression - av3ntador - 06-08-2016
(06-08-2016, 10:47 AM)barrote use it til it dies ,
somewhere in the line it will go below 10bar and then start to smoke and misfire. then u need to rebuild it cause u can´t do nothing else ...
and by the way something is very wrong there, usually is the 6th cylinder wich starts to complain...
good luck whaever u decide.
I found it weird too. According to the previous owner, the engine was rebuilt at 120k miles. Could it be because it has been sitting for 2 years? Maybe driving it might help the compression a bit, or will that make no difference?
I think I might just rebuild/overhaul it with forged internals when I gather up enough cash. Then it'll be a real build. I'd probably put the 24 valve head on it and maybe even bore & stroke the block.
RE: Om603 Low Compression - barrote - 06-08-2016
the engine was stopped for 2 years ?
u have more than one problema with it , i´m afraid. the assle comes when after 30 years old stopping for 2 years and start after...
things like gaskets may not hold... erosion in the head , rust in metal parts like valves and seats, all those things......
my advice is still the same , use it til it breaks then have it rebuilt...
good luck.
RE: Om603 Low Compression - Tito - 06-08-2016
Just drive it around. When a engine has sat for a long time give it some time to free some things. Like the valves not seating properly due to debris and dust. And when the piston is down in de cylinder the piston rings tend to lock in the piston because clearance is smaller down in de cylinder. A few revs from the starter wouldn't be much useful.
RE: Om603 Low Compression - EvoPeter - 06-20-2016
I spray some wd40 into the cylinders and let it work for 48h. It dissolves the soot between the piston rings and free them if they are stuck with to much soot. Have made difference in my engines when cold starting and bad compression.
I use 1 big bottle for one engine.