Anyone have Trouble with there Precision turbo?

[rb25drag]

Well Seems I killed my 1st turbo. I got 15 dyno pulls at 8psi and about 20hwy pulls gradually upping the boost and Stopped at 15psi, The car started pouring smoke out after 2 pulls at 15psi. Took the turbo off and It killed the rear journal bearing, No wear on the shaft and it BARELY scrapped the exhaust housing. No harm done other than the journal bearing.Now my only problem is. I cant find a re-build kit and 2nd. Why did it wear out the journal bearing so quickly? I thought precision was one of the best in the buisness?

The guy I talked to about it says the only thing he can think of is compressor serge, WHich IDK that when my BOV wasnt working 100% correctly that it didnt start a problem. But I have drove it alot since I fixed that problem.

Any Idea's or tips to where I can find a re-build kit?

Turbo: 400-6076 6076S Boosted , Housing:TH6876A , .68 a/r

[Carl H]

what kind of oil feed line do you have...might just be over oiling...

[jdmser]

I thought Precision used Garrett center sections with their own wheels and housings. If so, then wouldn't a Garrett rebuild kit work?

[rb25drag]

I Had a oil line made at NAPA, Its made of hydrolic hose and pressed fittings, Although I had to cut the Block Fitting and Braze the Stock block fitting into my line.

I thought Precision used Garrett center sections with their own wheels and housings. If so, then wouldn't a Garrett rebuild kit work?

I have heard that. But The guy from Precision has not confirmed that yet.

I have a local Precision dealer and he says he has Never had anyone ask for a re-build kit. So Hopefully I can find something, Or make my own Journal bearings. They didnt look too complicated to make.

[Shocker]

Most likely restrictor related. Generally journal bearings only need a -3 line hooked to them, however some require a small restrictor. After my issues with my 35r I just made sure Precision supplied w/e restrictor was needed for my 67mm.

Making your own bearings is possible if you have the right machine tools. However as cheap as rebuild kits are for them I wouldn't waste my time. If the wheel scrapped the housing to much it most likely will need a rebalanced otherwise you might pre-maturely kill off more bearings...

[jdmser]

I'll double check that with my builder. He was sponsored by Precision for a while, that's his 2.3 turbo Mustang on their page. He's been running their turbos for a long time. I'm sure he's had a few rebuilt in his day.
Modified by jdmser at 1:17 AM 6/23/2009

[maryjane]

are you running a -4 or a -3 feed line? i blew a rear seal on my first greddy turbo with a -4 feed line then switched to a -3 an line, havent had a problem with it yet, its been over a year and a half so far on this turbo.

hope this helps!

[240z4u]

A buddy of mine had TWO precision turbos bite the dust within 1k miles. This happened 6 weeks ago.

[Carl H]

gotta use the larger restrictor...i like to tap the fitting going into the turbo half way thu, finding the apropriate hex head set screw and drilling a 1/16" hole thru for journal bearings.works a treat and a charm every time.

[rb25drag]

Most likely restrictor related. Generally journal bearings only need a -3 line hooked to them, however some require a small restrictor. After my issues with my 35r I just made sure Precision supplied w/e restrictor was needed for my 67mm.

Making your own bearings is possible if you have the right machine tools. However as cheap as rebuild kits are for them I wouldn't waste my time. If the wheel scrapped the housing to much it most likely will need a rebalanced otherwise you might pre-maturely kill off more bearings...

Well The guy Michael From Precision said Journal bearing turbo's dont require restrictors, But Ball bearing turbo's do.

What is the Diameter of the -3 line? I will have to check my size.

The Turbine wheel Just Barely scrapped the housing. It didnt make any type of groves or anything. Just Barely turned shiny. I don't believe it needs any balancing. I luckly caught it quickly.

But if you guys are killing turbo's with to big of an oil line, I need to look into that.

But something has caused it to go out quickly. So I would like to find it before I kill another lol

[rb25drag]

gotta use the larger restrictor...i like to tap the fitting going into the turbo half way thu, finding the apropriate hex head set screw and drilling a 1/16" hole thru for journal bearings.works a treat and a charm every time.

Is a 1/16 hole really big enough? I hear alot of guys sending turbo's back to there manufactor and they say it is starved for oil. I think my fittings are close to 3/8's Thats a huge difference from a 1/16th hole.

[Carl H]

as per garrett spec.if your fittings are 3/8" then thats -6, MUCH too big for an oil feed and definately need restrictors.

1/16" = .06" - for journal bearings1/32" = .03" for bb turbos

[rb25drag]

Ok thanks for the info man. I will look into and change my setup.

[DrifterProdigy85]

-3 line is a 3/16" line.

[rb25drag]

-3 line is a 3/16" line.

So is the hole suppose to be 3/16" or 1/16"?

[rb25drag]

Well I just got off the phone with precision, They do not sell rebuild kits, They only rebuild them in house and its 185$ Which Blowes IMO

Also he says the journal bearing turbo's require a -4 line Which he said is 1/4" Hole. I have a 1/8" hole in mine currently, ( Checked it today) He says im starving it of oil.

Im really debating making my own Bearings Im tired of over paying people for service. IMO the kit should not cost over 40$ and The labor they are charging 140$ for an hr job.

[Shocker]

Better than my quote of $1300 to rebuild my 35rl... Be glad it was a journal bearing.

That price doesn't seem to bad.

[maryjane]

dam that sux

[240z4u]

Well I just got off the phone with precision, They do not sell rebuild kits, They only rebuild them in house and its 185$ Which Blowes IMO

Also he says the journal bearing turbo's require a -4 line Which he said is 1/4" Hole. I have a 1/8" hole in mine currently, ( Checked it today) He says im starving it of oil.

Im really debating making my own Bearings Im tired of over paying people for service. IMO the kit should not cost over 40$ and The labor they are charging 140$ for an hr job.

Your also paying for a warranty I am sure.

[rb25drag]

Ya im not sure exactly what im going to do yet. Im still thinking lol, I also just got laid off my job so I might have to put the project on hold again.

[PorkChopExpress]

your not complaining enough. tell them you want replacement parts for your turbo or have them tell you what company makes there turbos, your never using there products again and will smear there name every chance you get.

[rb25drag]

Well I found a local machine shop that had Journal bearings Identical to mine. Looks like a standard Garrett kit will work. So I re-built the turbo, and Drilled out my fitting to 1/4 inch as Precision recommended.

I also Decided to take a look at my feed line fittings. When I made my line I Brazed the Original Stock Block fitting to my new line, Well What I didnt notice the first time was the Stock feed like Is Restricted, I dunno If I could stick a needle in that hole. So The Problem all along was my feed line was restricted and the lack of oil killed the turbo. But now that its all fixed it spools nearly 2k rpm faster lol. Its happy again.

[Carl H]

ah, i forgot about that...normally that fitting is replaced but it is indeed restricted from factory due to the standard turbo being ball bearing.I drilled mine out to about a 1/8" and put a restrictor on the fitting into the turbo.

[S14-NEO]

ill be curious to see how long its going to last, anytime you take a turbo apart it has to be reblanced...due to the fact it spins at such a high rate of speed , if its not perfectly balanced its will self destruct in a very short amount of time...

[rb25drag]

If you take the turbo apart and make sure you mark the shaft and the turbine and line them up exactly the same I dont see how it would make it out of balanced, Mine had markings on the shaft and the turbine. I also put my own markings to make sure it lined up back as it did from factory. Also mine didnt see any damage to anything internally except the journal bearings so There should be No reason it dont hold up.

I drilled my feed line to 3/16 and my fitting on the turbo is 1/4inch. The turbo internally has oil feed holes that really are self restricted. There should be no reason to restrict this turbo in any way for oil feed. If you have a bigger feed line it doesnt matter cause the turbo will only allow so much oil in and I was told the turbo will uses the extra oil pressure to circulate what oil is being used.

So far I have done a few pulls around the block. The turbo spools really quick now compaired to before. I had a coupler blow off last night at 17psi and it caused a pretty nasty backfire, It split my intake piping coupler in 2 pieces and blew the mid section intake gasket again. But I got it all fixed today. Im going to let everything settle in over the weekend and see how it all works out again on monday.

[S14-NEO]

well i wish you all the best, but take it from me ive been there. youll be redoing it in a month more than likely...ive also seen turbos professionally built and it is most definately an art to balancing the rotating assembly.

[rb25drag]

ahh its cool man. It costed me nothing to give it a try. So even if it screws up it didnt cost me any more than it would have to send it out. So far it sounds good. Thanks for all the info guys. Ill be updating the Propane build thread soon. I hope to get some more testing in next week. Hopefully a New Intercooler design will be tested soon!!