up and down shaft play?
- Thread starter TURBO2010
- Start date
corofin12345
Member +
the sad truth is when theres any play at all on the shaft the oil seals will wear fast enough.. as the journal bearing wears the oil seals also wear out
Aidan@EP-styling
Trader
There will be a little up and down play until the engine is started and a constant stream of oil runs through the bearing! But that should be very minimal play.
It is also bad practice to be yanking at the turbo shaft checking for play, it should be done very very gently otherwise you can upset it.
JasonGlanza
Lifer
as others said
corofin12345
Member +
i suppose if we want to look more into this then ill start.. ive openend over 12 of these ct9's at this stage and all had minimal shaft play but were all blown.. all turbos suffered the same symptoms.. (sorry i dont have the correct names and ares for things but bare with me)... ive noticed where the journal bearing sits at exhaust side, that the oil channel for that bearing gets clogged up and cakes and hardens like cement, so what ends up happening is the bearing over heats and wears down and in turn wears down the oil seals "wich are made from spring steel"... heres the interesting bit tho..... as the oil passes beyond oil seals it meets the high temps from the mani and cakes again... if you look at the back of exhaust wheel ull see a step and this step fits into a recess on the main housing . as the oil makes its way out and cakes, it forms an non natural seal which actually prevents the oil from coming out of housing but over time this wears down the step on the back of exhaust wheel and bye bye turbo... the turbo i have on my car has been on it since i rebuilt the car,(about a year and 3 months) it blew oil for about a week and stopped and hasnt happend again until last week.. on inspection the step was completly worn and the recess was completely caked with hardened oil.. if yee would like pictures of what im on about ill be happy to show yee as my explaination may be not the best.. pictures speak for themselves... ive seen this on both ct9a's and ct9b's and all had the same look so cant be a fluke.. ive rebuilt 4 of these turbos and i didnt use rebuild kits as they need to be balenced, (btw,im sure its the compressor wheel thats balenced, not the shaft but in bad cases the shaft needs to be balenced also..all the compressor wheels i have here have small drill hols on the back of them, different sizes).. i just swapped over the journal bearings in all 4 turbos and they are still going strong but if the shaft is 2 worn where the bearing is on exhaust side,a rebuild kit is needed.. budget turbo building FTW.. had to get that out before i forgot about it..lol
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corofin12345
Member +
can only agree with ya and i honestly think its cause of a badly designed oil chamber.. another worrying thing is all the turbos i have here are missing the second seal on the exhaust side so where does that go but back into the sump.. i have a turbo on my car now that i have rebuilt using good parts from other turbos but im going to pull it apart again in 2 months or so to see if the chamber is clogged again and give it a general check.. passes the time sur
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Vincent-ep91
Member +
you seem to know a fair bit about turbos, crofin
and iv also came accross a turbo with 100% no shaft play but the owner had taken out of his ca beacuse it was smoky! what happened there is anyones guess?
and iv also came accross a turbo with 100% no shaft play but the owner had taken out of his ca beacuse it was smoky! what happened there is anyones guess?
corofin12345
Member +
im no expert but just going by what i see with my eyes.. is he sure it was the turbo??
Vincent-ep91
Member +
without hi-jacking this thread, am ya i think it was the turbo. he still kept the turbo because it seemed so good and no shaft play.
its a bit of a hit and miss tbh buying a used turbo.
I think it largely depends on the word of the seller as he/she has probably seen it working. it more or less goes on their word and if u believe them.
its a bit of a hit and miss tbh buying a used turbo.
I think it largely depends on the word of the seller as he/she has probably seen it working. it more or less goes on their word and if u believe them.
turbo head
Munster Area Rep.
If its my old turbo your on about there was no shaft play wot so ever still have the turbo there and yes it was the turbo oil seals i changed the turbo and its perfect now not a puff of smoke and by god it was smokey lol worse than any honda
corofin12345
Member +
the true and sad thing about buying parts off people.. got most of the turbos i have for free so cant complain really.. i couldnt really tell unless i opened it tho.. id say its what i said above tho.. the step on the back of exhaust wheel and caked oil on the recess on main housing.. the step cut a channel into the caked oil so it appears theres no play but in fact the oil seal is probably fully worn and letting oil out past the wheel.. (i really need pics to explain, lol)
Vincent-ep91
Member +
indeed it was turbo head. well spotted hahaIf its my old turbo your on about there was no shaft play wot so ever still have the turbo there and yes it was the turbo oil seals i changed the turbo and its perfect now not a puff of smoke and by god it was smokey lol worse than any honda
Aidan@EP-styling
Trader
Crankcase pressure in the engine is a turbo killer.
An engine with a blocked PCV valve will blow a turbo after some time.
An engine with a blocked PCV valve will blow a turbo after some time.
turbo head
Munster Area Rep.
dont miss much me lol
corofin12345
Member +
really? i suppose another reason not to got boosting from cold as the oil pressure is higher?