Cylinder leakdown test results/comments

[miked50]

Here's my last weekends fun
reset valves: they were bang on from last year except for cyl4, .002in high
done warm, set to .010in

compression test (440 is a brand new engine)
done warm
cyl1 425
cyl2 415
cyl3 405
cyl4 435

leakdown test
done last(~ 2 hours after shutdown, was in a heated garage though), so still a warm block
cyl1 10% no noise, couldn't really tell where any air was coming from
cyl2 18% noise, air leakage from crankcase (dipstick tube)
cyl3 18% noise, air leakage from crankcase (dipstick tube), and from intake (a tiny bit)
cyl4 9% noise, it was coming from the crankcase.

wondering also if you changed also your timing belts. or you may want to recheck the timing too.

btw, i set the valve clearance on my motor at 0.25 mm (HOT)....

carbon buildup on the valves may be preventing a full seal even when hot.

hth

[strada-caster]

I did the timing belts, water pump, tensioners, front seals routine last april.
I set the belt timing to the 7° ATDC i believe it states on the underside of the hood, and got my IP timing checked at a shop afterwards.

If there was carbon buildup on the valves, would I not have found that during the leakdown test? it seams like cyl3 might have some buildup on the intake. Are you talking buildup on the sealing faces? or on the stems above the sealing faces?

[miked50]

i forgot to tell you also that the last time i did the head gasket, i found a vertical scratch on the cylinder liner #2 which is the most probable cause of the engine's blow-by. remaining 3 cylinders were clean.

maybe it's not with the power source. it could be with the drivetrain. have you checked your clutch or A/T? or the brakes (dragging)?

[strada-caster]

i've read lots on the 2-stroke additive, looks like something good to do, although I haven't done it yet.

I'm going to do my brakes shortly. I have the squeal from the front pads. and i know the rear shoes are nearing their end.

I also have a growl from somewhere in the driveline. I think my steady bearing rubber housing (along the 2 piece rear driveshaft) is going again. although this just started happening, so I don't think it's part of my problem.