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Old May 16th, 2019, 14:25   #1
jublybug
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Default oil pump picture/ info please

Dose anyone have or can take a few detailed pictures of a 1.9 tdi oil pump .especially the pressure relief valve . Exploded diagrams or anything . Im in the process of sorting my oil pressure issue. Ive had the relief valve out of the filter housing and it looks and feels ok so I'm on to the pump valve as the suspected culprit so any Info would be great

Thanks in advance jim
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Old May 17th, 2019, 08:52   #2
BobnOH
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There's nothing to them, they don't so much pressurize as throw oil up to the valve train. There's no relief, but there is a pressure valve spring thingy behind a screw plug. You can put in a heavier spring for more umpff.
Having been thru this (low oil pressure) I might interweb guess you have spun crank and/or rod bearings. These are what creates pressure in the block.
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Old May 20th, 2019, 00:20   #3
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Thanks for the reply . Where abouts on the pump is the plug? . I'm suffering to much oil pressure not to little . The miles and amount the cars towed if I had a bearing fault there would be bits of crank on the road by now .its mainly when cold if I set off hard up the road from my home the car eather runs on a couple of cylinders with loads of smoke (diesel ) or dies and spins over with no compression . Give it a minute to let the pressure drop and the car will start no problem small amount of smoke quickly clearing and driveing normal once warm its not an issue . I believe its valve jack.

Jim
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Old May 20th, 2019, 04:40   #4
AndyBees
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I cannot imagine anything about the oil pressure (too high) that would cause the symptoms you describe other than turning the hydraulic valve lifters into solid lifters. (Valve Jack.... ) Would that cause the lifters to keep the valves open slightly, don't know? But, if so, likely the valves would get smacked by the pistons, thus now trashed.

But, I do believe the pressure relief by-pass valve in the oil filter housing would divert the over-pressure back to the oil pan. So, I think something else is going on.

Keep us posted!

Edit: Have you put a pressure gauge on to see actual pressure?
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Old May 20th, 2019, 11:30   #5
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Its the only conclusion I can come to .cant think of any other way of losing compression then it coming back . Only happens when cold also it would only take a small amount of valve lift to lose compression the head is off at the moment and no signs of contact on pistons or valves . . I haven't had a oil pressure gauge on the car I do plan on fitting one to keep an eye on what's going on . . Sump is coming off next so I can see if there's anything in there .may aswell im not planning stripping the engine again hopefully for a long time

Jim
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Old May 21st, 2019, 11:14   #6
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Ok so got the sump off tonight and Ive found what looks like threads (half coils of aluminum) in the pick up strainer .some actually partly through the mesh . ?

Jim
pump off tomorrow I think.

Last edited by jublybug; May 21st, 2019 at 11:15. Reason: spelling
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Old May 21st, 2019, 12:23   #7
BobnOH
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Sounds like you gotta worser problem. How do you know you're pressure is too high? These engines are all over the place, car only monitors the pressure within certain RPMs.
Is it possible compression is venting into the block?
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Old May 22nd, 2019, 12:11   #8
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Ok so pump off tonight .striped ,inspected and cleaned no signs of wear there is the odd scratch and what looked like pin marks as if something's maby gone through it . But I'm happy it turns free and has plenty service life so I've reassembled it oiled it and spun it by hand and it pumped oil in seconds. So next I think I'm into checking oil galleries also I'm going to remove the oil cooler under the filter housing incase anything ended up in there.

Jim
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Old May 22nd, 2019, 12:28   #9
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With metal shards in the pump, decent chance the oil cooler is clogged.
[ignore my earlier post about bearings, that's just for Low oil pressure]
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Old May 22nd, 2019, 23:46   #10
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Next question is the a removable plug to clean out the oil gallery's and which end of the block is it? Hopeing its not the flywheel end .

Jim
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Old May 23rd, 2019, 06:46   #11
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Quote:
Originally Posted by AndyBees View Post
I cannot imagine anything about the oil pressure (too high) that would cause the symptoms you describe other than turning the hydraulic valve lifters into solid lifters. (Valve Jack.... ) Would that cause the lifters to keep the valves open slightly, don't know? But, if so, likely the valves would get smacked by the pistons, thus now trashed.

But, I do believe the pressure relief by-pass valve in the oil filter housing would divert the over-pressure back to the oil pan. So, I think something else is going on.

Keep us posted!

Edit: Have you put a pressure gauge on to see actual pressure?
It actually DOES happen, and I have seen it multiple times on multiple engines. A new oil pump fixed it every time. I had one peg an ATF pressure gauge that went to 300 psi
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Old May 23rd, 2019, 11:28   #12
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Quote:
Originally Posted by oilhammer View Post
It actually DOES happen, and I have seen it multiple times on multiple engines. A new oil pump fixed it every time. I had one peg an ATF pressure gauge that went to 300 psi
Wow your the first person that's said they have seen the problem and fixed it . Have you seen this on VAG tdi,s ? And did you ever strip the pump and find any issues with them? . Ive had mine in bits and found no real issue it had minimal wear and all seemed well.

Thanks for the reply

Jim
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Old May 23rd, 2019, 11:41   #13
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He may be the first, but Oilhammer has worked on these cars as much as anyone. And he's good. I've sure never heard of that condition, but as my handle suggests, I'm not a mechanic.
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Old May 24th, 2019, 03:40   #14
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I have seen it on an ME engine (1986.5 1.6L diesel), several VR6s (A3 Jettas, couple Eurovans), an AEG 2.0L, and a couple AZH 2.0L engines.

Cold start, sometimes if the engine is allowed to idle for a few minutes, it will not act up, but increasing the RPM a little after a cold start will cause them to start missing and stumbling, because the lifters are overpumping and hanging the valves open.

I never messed with taking an oil pump apart. They are cheap, and once you have it out, why waste the time? I do not even bother to check oil pressure anymore when I see this happen, I just replace the pump.
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Old May 24th, 2019, 07:25   #15
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Yes that's the exact issue .usualy I would just let it warm a little and drive steady till warm . But the head gaskets gone so I've got the time to investigate the oil issue now . . Just don't like spending on parts unless I can see a problem with them . ( I am from Yorkshire ) being such a basic item and there being no wear I could see and the big valve is clean and working when pressed on it all looks well .

Jim
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