Your rocker seals probably need doing but if you have high crank case pressure, it'll force more oil out. Probably worth doing the compression test and ideally a leakdown test before you replace the seals because if it's a piston, ring or head issue, the covers will have to come off again.
Good luck,
Simon
Your rocker seals probably need doing but if you have high crank case pressure, it'll force more oil out. Probably worth doing the compression test and ideally a leakdown test before you replace the seals because if it's a piston, ring or head issue, the covers will have to come off again.
Good luck,
Simon
Would high crankcase pressure increase pressure under the rocker covers? I was under the impression that the entire crankcase was sealed by the heads and the head gaskets?
C
The spread seems reasonable, but are they not all quite low? I would have thought high hundreds at least. I'm sure someone will be along who knows the correct figure.
Right, compression test just done, after the hastle of getting one that would actually fit, and results are
cyl 1 140 psi
cyl 2 150 psi
cyl 3 155 psi
cyl 4 150 psi
cyl 5 145 psi
cyl 6 150 psi
cyl 7 145 psi
cyl 8 145 psi
to my mind these figures seem to be within acceptable tolerances, unless of course you know different!!!
I really wouldn't worry about a leak down test. A leak down test with the piston at around bottom on firing stroke will test the cylinder / bore / piston and valve sealing. Following this you might do a compression test which dynamically adds in test for valve sealing. Cold leak down is something I would do on an engine I didn't want to spin up just to get a heads up. So you won't learn anything extra (in my opinion)
As you already have pretty reasonable compression test readings - for an 11:1 compression ratio upper number would be 160's and acceptable down to 145. Variation is less than 10% so all good. 1 is marginal but, again in my opinion, an indication of wear and not a problem/fault indication. A 'hot test' may just show it has bedded in differently.