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Cylinder 5 No Compression


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Hey guys,

Recently my car had started playing up. After seeing that the problem had nothing too do

with the coils, i narrowed it down that cylinder 5 was the one playing up.

After doing a compression test it read too be under 50 which meant either the valve was playing up

or a piston ring had broke.

After i checked my oil i noticed there was non left in there! So i filled around 3 and a half litres at my

cousins place then drove it home. In the morning i checked the oil, and there was no oil left!

So this means that defiently a piston ring is broken?

If so does anyone know anyone or anywhere that supplies a piston ring kit for Rb25det, also with the

conrod bearings and sump gaskit etc.

Thank you!

Samir

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Hey guys,

Recently my car had started playing up. After seeing that the problem had nothing too do

with the coils, i narrowed it down that cylinder 5 was the one playing up.

After doing a compression test it read too be under 50 which meant either the valve was playing up

or a piston ring had broke.

After i checked my oil i noticed there was non left in there! So i filled around 3 and a half litres at my

cousins place then drove it home. In the morning i checked the oil, and there was no oil left!

So this means that defiently a piston ring is broken?

If so does anyone know anyone or anywhere that supplies a piston ring kit for Rb25det, also with the

conrod bearings and sump gaskit etc.

Thank you!

Samir

ouch that doesnt sounds good, but seriosuly something like oil should be checked (the level) atleast once a week.

Was there no oil whats so ever or it just didnt register on the dip stick. Where you still getting oil pressure?

Unless you have a massive oil leak (and if you lost 3.5L in a drive home just by it dropping oil would be EVERYWHERE), its burning or you have massive piston blowby and it filling up your cooler aswell. Is it blowing a shit load of smoke? Any Knocking noises?

I'd say you have either melted/chipped a piston or broken a ring which case your more than likely need new pistons let alone just rings. You probably have damaged your bore aswell and are most likely up for a rebore or hone at the very least.

So pretty much its full rebuild time, ie new pistons, rings, big end and main bearings etc etc (and if you have been driving around with no oil you might have damaged the crank aswell), or get a 2nd rb and drop it in and hope for the best.

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Oh man hehe :(

There is still oil pressure, yeah it didn't show on the dipstick.

There is no oil leaking on the ground anywhere

and when i drive no smoke comes out unless i push it a little bit :)

Also no knocking noises.

I hope it's only the rings!

Only on cylinder 5 there is a lack of compression

every other cylinder is fine

Thanks

Samir

Edited by Taxi33
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Oh man hehe :P

There is still oil pressure, yeah it didn't show on the dipstick.

There is no oil leaking on the ground anywhere

and when i drive no smoke comes out unless i push it a little bit :(

Also no knocking noises.

I hope it's only the rings!

Only on cylinder 5 there is a lack of compression

every other cylinder is fine

Thanks

Samir

yeah i hope for you its only rings, but regardless i would be giving it a full rebuild while it was out, especially now you know that it had bugger all oil in it. I dont know how hard it would be for you but try and take the intake pipe off that goes to the turbo and see how much oil is in there, your rocker cover ventilation goes to your intake pipe so if there is excessive piston blowby from a busted piston you would expect oil to be filling up in your intake. If you have an oil catch can, you probably would see that its filling up aswell

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No idea where all the oil went,

Defiantly not on the ground though when i accelerated a bit hard

smoke came up through the gearbox and white smoke came out

of the exhaust :P this is before i knew it was cylinder 5 playing up

Thanks

Samir

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Are you sure you filled the oil into the engine and not the radiator?!?!? cause if it was gone in such a short trip, it wouldve had to be blowing shitload of smoke, and or a big hole in ur sump. also, just incase, check ur intercooler, for oil. you might find it full with oil.

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its going to be a bitch to take the piston out from underneath unless you take the gearbox off, take the main crank seal housing, oil pump, oil squirters etc etc and drop the crank.

it will probably be easier to take the head off and just replace the rings and slap it back together if you want to do it on the cheap, but you might as well do the main and big end bearings while its all stripped (it'll only cost you around $140 extra for ACL bearings if you're doing it yourself).

you'll need to check the clearances of the bearings and the bores too, and figure out why only #5 lost compression.

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its going to be a bitch to take the piston out from underneath unless you take the gearbox off, take the main crank seal housing, oil pump, oil squirters etc etc and drop the crank.

it will probably be easier to take the head off and just replace the rings and slap it back together if you want to do it on the cheap, but you might as well do the main and big end bearings while its all stripped (it'll only cost you around $140 extra for ACL bearings if you're doing it yourself).

you'll need to check the clearances of the bearings and the bores too, and figure out why only #5 lost compression.

Yeah true,

Though im not too sure if the piston will still be the same.

People are saying that it could be damaged like.. a hole init

or melted so yeah ;)

I think it'll have too be a full rebuild.

Yeah will be doing it all myself, well with my brother/cousin and dad helping me

because they all have a good amount of mechanical knowledge between them.

Going too take it too my brothers work on saturday (hpf) hopefully they'll know whats

up with it and what will need too be done.

Yes.. I'm sure i filled the oil in the correct place. Before i started driving it read full on the dipstick.

The next morning it read empty :(

Thanks

Samir

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yeah dude, a melted piston is nasty as hell. look at the pic on my avatar. that was after a nasty little boost spike at WSID. i ran a 14.0 on that run though.

ive got some rb25 pistons here if you're after some.

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