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Engine Specific Info and Questions => IDI Engine => Topic started by: RedRotors on February 08, 2012, 08:20:50 am
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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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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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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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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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It could be that there is not enough valve guide to valve stem clearance and/or excessive emp's.
http://www.vwdiesel.net/forum/index.php?topic=30231.30
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any updates?
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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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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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Just to clarify Marc, when you refer to boost, do you mean from the turbo, or the oil pressure???
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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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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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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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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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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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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 ;)
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NE Ohio... myke_w never told you of me?? his starting life in vw and diesels is due to my father.. LOL.. i knew him way before his own shop and his freshman year of school working in "parking" :P
i was fed up with family business at that point and was gettin my education.. LOL.. i was a supervisor for parking when i met him first time.. so known myke_w 13ish years...
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. since i had rebuilt the head
Had you done any thing to the bottom end of your engine?? I had 2 mech lifter engines that I had high oil pressure issues with.. Complete rebuilds on both.. They both would balloon the filter unless let to warm up.. Even a blip of the go pedal to get the alt charging would blow em apart.. The one blew an oil pressure sending unit apart at the same time the filter blew.. I had the proper diesel filter (Mann, Wix, Hastings, Bosch) they'd all pop.. I tried several oil pumps, including the original that was more or less just fine.. Checked the relief valve and it seemed to be working other than it couldn't bleed enough pressure off fast enough.. Bearing clearance was within the specs..
My final solution was to run really light oil till the weather warmed up and the engine broke in..
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i had taken 3 1.8 8v engines to build 1 10:1 1.8 8v.. so yea everything was touched..
one had hole in block for the hydro head.. this was back in 94..
one was a gold label vw reman block that had the 10:1 pistons, but tried to throw a rod.. good block/pistons
one was for the crank/rods that was cooked..
i used the 2nd one for the oil pump.. which in the end turned out to be wrong as it had the wrong sized oil pump gears.. but its releife valve was stuck big time.. i unstuck it.. and no more issue till well oil up to 100*c and had less then 22psi at 2000 rpm.. used the cooked oil pump at that point for proper oil pressure when warm..
still one o fmy fav engines i ever built.. actually regret buying a 2.0 in 96 to replace it.. it would pull over 7k strong.. and got 2mpg better then the 2.0 ever did..
to me it almost sounds like you had a hydro oil pump on a solid lifter engine.. but till you take the pressure releife valve apart to see if the piston moves free.. cannot say.. its spring is too hard for diy on bench..
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I thought too that maybe the new pump I got was for a hydro, but apparently not... I swapped a couple used pumps on from mech engines (heck I didn't even have a 12mm block laying about at that point yet) and the same thing.. I had to run 5w20 in the thing till the weather was consistently above 40 degrees (had about 7500 miles on it at that point) then went back to 15w40 from there on out with no issue.. ???