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Compression Problem After Rebuild

SECURITY

By SECURITY,
in Engines & Forced Induction

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Cubes Grand Master

Cubes

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Security,

How did the new lifter feel? Were you able to push it in and out?

I have roughly half of a set of 24 lifters that are able to squeeze in and out freely, others some are simply solid and a few are able to move slightly.

My old man said his ol HQ hydraulic lifters were solid and that you shouldn't be able to squeeze them in and out.

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SECURITY Grand Master

SECURITY

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dont muck around with trying to fix them. if you inspect them all carefully you'll be able to see which ones are stuffed, if not dont worry about replacing them. i'll post pics tomorrow on what the stuffed one on mine looked like.

Craved Grand Master

Craved

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You said you blew them out? Maybe pumped air in to them?

I have a set of lifters soaking in diesel and appears to have really pulled quite a bit of crap out of them, the little hole on the top and side I can see a little stream of black crud.

One of the 24 lifters felt as if it was a little stuck so it will be interesting if it fix's it or not.

I'll give the kero a go.

I had thought about heading down to bunnings and picking up some toluene for the clean.

Yes Toluene is pretty damn nasty... :spank:

I'll stick with the diesel and kero.

I've never had any dealings with lifters before.

How are they supposed to feel? I'm assuming they are supposed to pump in and out easily, I have a 8 that are nice and free where as some of the other move a little and some are completely stuck.

still curious if this is the best way to clean the lifters out, im thinking i should start soaking the set from the spare head i have at home, so that they are useable when the motor is together.

also curious on hoy the lifters should feel when not under pressure.. should they be stiff or move freely?

wrxhoon Grand Master

wrxhoon

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still curious if this is the best way to clean the lifters out, im thinking i should start soaking the set from the spare head i have at home, so that they are useable when the motor is together.

also curious on hoy the lifters should feel when not under pressure.. should they be stiff or move freely?

You can clean them with kero if you like but you must bleed them if you don't they may not bleed themselves.

The best way to bleed them, submerge them in oil upright, get a thin strong wire put it in the whole and press it down then pump the lifter with your hand ( while holding the wire pressed) until all the little bubbles go. When the lifter is bled it will be very hard, you wont be able to push it down after you take the wire out.

Craved Grand Master

Craved

Posted
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You can clean them with kero if you like but you must bleed them if you don't they may not bleed themselves.

The best way to bleed them, submerge them in oil upright, get a thin strong wire put it in the whole and press it down then pump the lifter with your hand ( while holding the wire pressed) until all the little bubbles go. When the lifter is bled it will be very hard, you wont be able to push it down after you take the wire out.

Thanks for that :spank:

anychance you can dumb it down a little more?

upright being cam lobe side up?

whole = oil feed hole in the side of the lifter?

cheers

wrxhoon Grand Master

wrxhoon

Posted
Posted
Thanks for that :)

anychance you can dumb it down a little more?

upright being cam lobe side up?

whole = oil feed hole in the side of the lifter?

cheers

Yes, the way its in the cyl head, thats upright, i never plyed around with rb25 lifters but usully the whole is on the top of the lifter( Sr20 are like that so i asume rb25's will be the same )

You should also measure the lifters for wear/ clearances, when you install them start the engine and run it for a few minutes without load, if they are not quiet after that they more than likely need replacing.

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