oil pump access without pulling engine

[zopapp]

hi all,

I have a low oil pressure issue at start on my not so long ago rebuilt 2l air-cooled engine (CU motor code). Theory is that oil oozes back into the pan as air can get into the pump as I think i never installed an O ring into the pump. (Sure enough, I found the O ring in the gasket kit on the shelf…)

Oil pressure is otherwise looking good, 15 psi at around 1200 RPM hot nicely creeping up to 45 psi when I rev the engine. At cold at idle it is around 60 psi.

I am planning to fix the issue, that made me think weather I can get access to the pump without pulling the engine. There are some threads on this topic, but I could not find a definite answer for my case.

thanks in advance,
cheers,
Zoltan

[sjbartnik]

I think it is possible, though it may be more difficult to do with the engine in the car than just pulling the engine.

You would have to remove the muffler, the rear tin, the fan, and the fan housing.

I think there is also a mounting bar that goes across the width of the engine at the rear of the engine. This may or may not block access to the oil pump (I don't remember, but I suspect it probably does). At that point you should have access to the pump.
_________________
1965 Volkswagen 1500 Variant S
2000 Kawasaki W650

[mikemtnbike]

[jberger]

Yes, you can pull the oil pump with the engine in the van. You have to remove all the bits to actually pull the engine with the addition of the fan housing. It's not fun either way but such is life.

J

[zopapp]

Thanks All,

I managed to get to the oil pump without pulling the engine.
Indeed the moustache bar and the support cradle had to come off.
One quirk is that one of the heat boxes also had to come off to lower the moustache bar from the cradle.

I supported the case from under with a jack and a piece of wood.
Find some pics attached on the final reult. Took me and a mate around 5 hours to get to the pump.

The O ring I suspected to be the culprit is in place so the quest continous why I am having no oil pressure at start for a few seconds. I’ll start another thread on this.

Cheers,
Zoltan

[Ronzo_volvo_guy]

Zoltan;

An Oil Filter without a (or malfunctioning) check-valve can allow oil to drain back after engine (and Oil Pump) are OFF, and need refilling before pressure comes up, and this could explain your pressure delay after start-up, but OK pressure after that... Do you have a reputable Filter installed? ...even if you did, the first thing I would try to address the symptom is to change the Filter.

Good Hunting from Connecticut!

[9.5isCanadian]

[zopapp]

For information here is the other thread addressing the oil pressure issue itself:
https://www.thesamba.com/vw/forum/viewtopic.php?p=9763418#9763418

The filter came up there too. Something I'll check on. Thanks.

/Zoltan

[zopapp]

Owen,

The stud on the pic (5 or 6 mm) can be driven into the pumps backside after you have it out from the engine.

It is needed to take the pump apart. I simply pulled on the stud with a pair of pliers while standing on the flanges of the case. No big force is needed, you just need to overcome the O ring tension. I believe the stud bore is there for exactly this purpose.

For taking the pump out from the engine bore 1st off I loosened the block nuts around the pump, one above, one below. Then me and my mate wedged two big spanners between the case and pump flanges at either side and knocked on them ever so gently with mallets that eased out the pump nicely.

Cheers,
Zoltan

[Sodo]

I have done this.
I installed a slightly bigger oilpump without removing (something)
Maybe without removing the moustache bar?
I can’t remember, but $3.99 wrench + a little grinding, and I had a “special tool”.

I ground the box end of a 13mm wrench away, until it 'fit' over the stud.
It was kinda thin, but certainly strong enough for the task.
I used the wrench for some years after; then gave it to a fellow on Samba.
Member Alaskaberrys I think.
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'90 Westy EJ25, 2Peloquins, 3knobs, pressure-oiled GT mainshaft, filtered, cooled gearbox
'87 Tintop w 47k 53k, '12 SmallCar EJ25, cooled filtered gearbox
....KTMs, GasGas, SPOT mtb

[Alaskaberrys]