Author Topic: Stumped. No oil pressure. (Read 7054 times)

somepunk22 · « **on:** July 10, 2007, 05:07:56 am »

I feel a little dumb for asking, but here goes. 1.6TD. Fresh rebuild. Solid lifter. New bearings(including int. shaft) installed by a shop with a good VW reputation. Head gasket install correctly. New larger oil pump. New mechanical gauge reading at the head. 0 pressure during cranking. Spin the oil pump with a drill through the vacuum pump opening, and get pressure instantly. The intermediate shaft is engaging the vacuum pump, and the vacuum pump is engaging the oil pump. I'll move the gauge to the oil filter flange tonight, and see if I get anything. Any thoughts? Thanks.

saurkraut · « **Reply #1 on:** July 10, 2007, 05:47:54 am »

The only thing I can figure is cranking speed is a heck of allot slower than a drill driving the oil pump. Maybe pull you injectors so the cranking speed goes up, and maybe you'll see oil pressure in the head then, but I kind of doubt it. If you pull the gauge out of the head, crank it over while someone watches, and if oil comes out, your good to go.

I think its virtually impossible to install the countershaft, oil pump, and vacuum pump so that the oil pump does not get driven.

Barry W · « **Reply #2 on:** July 10, 2007, 09:35:12 pm »

During cranking your not going to see the oil pressure. The pumps just not spinning fast enough. My gasser doesn't see any pressure for the first 10 seconds of running as well.

Vincent Waldon · « **Reply #3 on:** July 11, 2007, 09:06:03 am »

Yup... if you try to spin the intermediate shaft with an impact ratchet (turns about the same speed as the starter) you will likely see no oil pressure either.. at least up at the head.

On both my Jettas the oil pressure light doesn't go out during cranking... and that's 0.7 bar or something small.

One exception... -30C winter mornings when the oil is really really really thick.

I'd be inclined to trust that you've proved the pump is working fine with a drill, put everything back together, and fire that puppy up. You can always shut down if you don't get oil pressure with 10 seconds or so.

Vince

MikkiJayne · « **Reply #4 on:** July 11, 2007, 10:35:53 am »

My TDI and 16V both get enough oil pressure on the starter to turn the light out in the dash. It only takes a few seconds, which I discovered when the TDI didn't want to start and during a compression test on the 16V.

Perhaps 0.7 bar isn't enough to make your gauge move?

I agree with Vince though. You've proved the pump works ok so fire it up and see what happens

Mikki x

somepunk22 · « **Reply #5 on:** July 14, 2007, 09:52:08 am »

Got it running, but I'm still not seeing any pressure. After a little bit of running, I pulled the pressure line out, and some oil spewed out. Started it up cold today with the line out, and didn't see anything. Shut it off after 20 seconds or so.

Vincent Waldon · « **Reply #6 on:** July 14, 2007, 03:16:37 pm »

Perhaps pull the vacuum pump and crank the engine, confirming that the IM shaft is in fact turning correctly.

It's a simple drive system so your problem is very strange... particularly since you can get pressure with a drill.

Vince

somepunk22 · « **Reply #7 on:** July 16, 2007, 04:45:19 am »

Pulling the oil pan to swap back in the original oil pump. Appears that the new pump drive shaft isn't quite long enough.

bigblockchev · « **Reply #8 on:** July 16, 2007, 02:56:01 pm »

It has been suggested to me that installing the head gasket upside down will result in no oil pressure. Worth a look. Dan

Vincent Waldon · « **Reply #9 on:** July 16, 2007, 04:11:46 pm »

Quote from: "somepunk22"

Pulling the oil pan to swap back in the original oil pump. Appears that the new pump drive shaft isn't quite long enough.

That would do it, although I've never heard of it before... perhaps not an OEM pump ??

somepunk22 · « **Reply #10 on:** July 17, 2007, 04:49:34 am »

Original on the left. What I thought was a 36mm upgraded pump on the right. I couldn't find a part number on the part, but I'll check receipts.

MikkiJayne · « **Reply #11 on:** July 17, 2007, 11:01:20 am »

Wierd! It would be interesting to know what that short pump is from...

Can I recall my 'start it and see what happens' suggestion? :roll:

Mikki x

myke_w · « **Reply #12 on:** July 19, 2007, 10:18:19 am »

I've seen timing belts so loose that they don't spin the int shaft, check that out while you're at it

Author Topic: Stumped. No oil pressure. (Read 7054 times)

Barry W