m42 tapping. help needed

[series88]

I picked up my 318 as a project about 3 months ago. Previous owner stated that it needs an oil pump and makes a tapping sound when running. I check out the car and decided that it's clean enough and I can gamble on it. After closing the deal, P.O was like, "fire it up just so you know engine works as well as the rest of the electricals and brakes" So I did. To his and my surprise it fired up just right and no noise what so ever. I even felt comfortable enough to drive it. I drove back about 50 miles back to my house, no problem. It was even perky and quick

After the car cools down, i start it up then the tapping sound is back. I dont know anything about m42s too be honest and I am looking for someone who might have dealt with this issue.

here's a sound clip

[series88]

Checked the oil pickup if it's clogged but seems to be in decent shape. Upper oil pan seems tight as well. I haven't really gone to the actual oil pump though.

[Massimo]

It is your lifters commen problem. If you know how to change them get the VW lifters I can't remember the part number now but they are lighter and cheaper.

when it is cool the oil is thick and not getting into the lifters cos they are dirty causing the tapping sound. the only way to fix is to replace the lifters. Mind you you could leave them like that if you don't mind the noise.

Here we go VW Lifters

[series88]

That would probably be my next check.But for lifters, i think it would have been making noise whether cold or hot but louder when hot. (my e36 used to do this.) I drove the car home around 50 miles never made noise. Just after shutting it off. But I've also read a whole oil pump situation. Ive read scenarios wherein timing chain tensioners, lifters and all have been replaced and the oil pump solved the problem.

[Massimo]

Thats odd I haven't heard of anyone having oil pump problems. But maybe I havn't come by them. the only oil pump issue I know of is a loose pickup the bolts usually work there way out causing low pressure. But you checked that.

My car the lifters would starting ticking when it was cold then come and go when it was hot. Or would go completely when I put the foot to the floor but that is expected as oil pressure is increased.

I doupt it is a bad oil pump but you can never be to sure. I would change the lifters first and see what differance that makes. The oil pump requires removing the head timing gear and case. Lots of work.

[bmwm42]

oil pressure relief valve probably the same shit thats going on with mine if they are stuck open your losing oil pressure up top cause lifters to tick

[series88]

Thanks again for your help on this. I really appreciate it

http://www.youtube.com/watch?v=z75g0iwqnVk

Check on this. Owner seemed to have changed everything and claimed the oil pick up was clogged. I did manage to get a piece of silicone that was partially blocking the pickup out. But I dont think it covered the whole thing though.

[Massimo]

Thanks again for your help on this. I really appreciate it

http://www.youtube.com/watch?v=z75g0iwqnVk

Check on this. Owner seemed to have changed everything and claimed the oil pick up was clogged. I did manage to get a piece of silicone that was partially blocking the pickup out. But I dont think it covered the whole thing though.

Usually what happens is the bolts come loose allowing the pickup to move around and also drop oil pressure. The other side affect to this is the gasket that sits between the upper oil pan and crank case moves which blocks the oil flow whick could be what you pulled out.

Like I said try changing the lifters first then if that dose not work then go for the oil pump and stuff. Glad to help one other note when removing the cams follow pelican parts artical on BMW cam removal they can break very easy.

[Dj Buttchug]

its not the oil pump. m42 oil pump set up is crank driven and pretty much bullet proof. It has one moving part. theres pretty much no way it can fail unless a dime size piece of metal becomes jammed between the pump teeth and if it did become obstructed the engine would seize. Its either go, or no-go with the oil pump.

1. lifters
2. Oil pressure relief valve

its one of these provided the timing case is in good condition and the tensioner has been replaced.

[series88]

Usually what happens is the bolts come loose allowing the pickup to move around and also drop oil pressure. The other side affect to this is the gasket that sits between the upper oil pan and crank case moves which blocks the oil flow whick could be what you pulled out.

Like I said try changing the lifters first then if that dose not work then go for the oil pump and stuff. Glad to help one other note when removing the cams follow pelican parts artical on BMW cam removal they can break very easy.

Thanks again! Will look into this

its not the oil pump. m42 oil pump set up is crank driven and pretty much bullet proof. It has one moving part. theres pretty much no way it can fail unless a dime size piece of metal becomes jammed between the pump teeth and if it did become obstructed the engine would seize. Its either go, or no-go with the oil pump.

1. lifters
2. Oil pressure relief valve

its one of these provided the timing case is in good condition and the tensioner has been replaced.

Hey Ryan,

Thanks again for the part and your info. Where would I find the oil pressure relief valve? Sorry to be a complete newbie. :)

[Dj Buttchug]

Hey Ryan,

Thanks again for the part and your info. Where would I find the oil pressure relief valve? Sorry to be a complete newbie. :)

You can find them on pelican or blunttech. You want the updated one which is plastic and less prone to sticking.

If you want to save some cash you can also pull out the pressure relief valve that you have and polish it. I did this on one of my m42s and it works well.

[series88]

what i meant was where in the engine would i find it?

[Marauder42]

what i meant was where in the engine would i find it?

http://www.realoem.com/bmw/showparts...04&hg=11&fg=30

#5-#8

I think this is it.

[series88]

Gotcha. Thanks