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1.9 AAZ engine 'problem'
by
RedRotors
on 08 Feb, 2012 05:20
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Hi guys,
A friend of mine had an 1.9td running 30psi and when it's cold, like winter time, and the engine is cold, too much
boost ( we think ) jack the lifters and then the engine stall, try to crank and it's turning free like no compression at
all, we let it settle down, and the engine fired up again. I think that there's a box in the original setup that lower
the boost when cold to avoid this problem ? But anyone know the exact cause ?
cheers,
Marc/
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#1
by
CRSMP5
on 08 Feb, 2012 05:33
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i had a issue like this once...
pull the oil pan...
pull the oil pump
there is a freeze plug looking thing on it, this is the oil pressure releife valve.. what you wanna do is drill it with a small drill bit across the freeze plug for a piece of wire to go thru when you PUT IT BACK TOGETHER.. now there is a hole in this freeze plug that i use a slide hammer on to pull it out.. be carefull as there is a spring and a piston inside.. bet the piston does not move freely.. or is stuck.. make it move freely.. LOL..
now he is doing all kinds of wrong.. 30psi when the oil is under 50*c is BAD for oil seals and such.. will blow them out and make all kinds of leaks..
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#2
by
RedRotors
on 08 Feb, 2012 05:55
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He's now running in WOT @30psi when the engine is frozen, but i will ask him the exact facts when this happen.
So it's the release valve in the oilpump that don't do it's job ? So what's the relation with boost ? at low boost, no problem
at all...
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#3
by
CRSMP5
on 08 Feb, 2012 06:53
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engine rpm = oil pressure when cold... has enough pressure to pop the lifters open far enough to not let the valves close all the way..
the releife valve for what ever reason is sticking..
i had this issue on a franken engine i built that was a gasser.. but it would pop the valves open as soon as it built pressure.. aka car fires then 0 compression..
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#4
by
andy2
on 08 Feb, 2012 19:11
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#5
by
CRSMP5
on 13 Feb, 2012 11:50
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any updates?
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#6
by
RedRotors
on 13 Feb, 2012 13:31
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any updates?
the engine is sold since a while... I was asking because i want to build an AAZ for a project and don't want to end up with
this problem, as my ALH is running high boost w/o problem.
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#7
by
CRSMP5
on 13 Feb, 2012 20:01
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ahhhh ok... no its not a common issue at all... usually the oil filter gasket blows first... ive seen that happen way more often... till your post mine was the only one i have heard of such odd things..
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#8
by
maxfax
on 14 Feb, 2012 18:28
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Just to clarify Marc, when you refer to boost, do you mean from the turbo, or the oil pressure???
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#9
by
R.O.R-2.0
on 14 Feb, 2012 18:53
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Just to clarify Marc, when you refer to boost, do you mean from the turbo, or the oil pressure???
charge air, im sure..
cause 30psi oil pressure @ WOT would be HORRID..
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#10
by
maxfax
on 14 Feb, 2012 19:15
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cause 30psi oil pressure @ WOT would be HORRID..
That was my thought, especially on a cold engine... Of course that makes less sense with the problem being discussed...
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#11
by
RedRotors
on 15 Feb, 2012 05:02
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Just to clarify Marc, when you refer to boost, do you mean from the turbo, or the oil pressure???
Turbo boost
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#12
by
maxfax
on 15 Feb, 2012 20:25
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Thanks for the clarification.. With that being said, I think CRSMP5 probably nailed what happened.. Nothing so much to do with the turbo...
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#13
by
CRSMP5
on 16 Feb, 2012 00:02
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well it took 3 days for me to figure out what was going on with mine.. since i had rebuilt the head and all i was worried i had sticking valve guids.. but reality is.. engine not warm.. LOL.. i am serious.. it would hit to fire up then 0 on all 4 holes.. i also had a diesel oil filter on it for the added 1/2 qt of oil.. which is the reason i think it did not pop the oil filter gasket vs gas ones that tend to blow the seal when this happens..
it is not common... till this thread my own is all i have ever seen do such a thing.. why i wondered what he had found out.. kinda sux that the project was sold off and we will never know..
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#14
by
RedRotors
on 16 Feb, 2012 16:15
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I agree, it's sold now, but because I will probably built one, we will see if the ghost will come back..
PS : Plz fill your location ID CRSMP5
