I had to replace the water pump on my 84 NA 944, and replaced the timing belts while I was in there. I've done it before and everything went smoothly. When I finished I purged the air out of the cooling system, letting the car run until the fan came on and shut off again. No problems. This morning I went out, fired it up, and headed out. After one block the oil pressure light and brake warning lights came on, and the oil pressure gauge dropped. I went straight back to the garage. It seems I now have no oil pressure, and I'm stumped as to what could have happened. I torqued the crank bolt down properly. The oiling system seems pretty straightforward, a pump, pressure valve, and filter-cooler. No relays or anything to go bad. I wonder if it's possible for the pump gear to not be engaged, or if the pressure valve suddenly failed. And what's with the brake warning lights? Anybody have any thoughts?

 

Are you sure its torqued down tho? Maybe its backed itself out somehow?

 

I'll second the crank bolt, unless you had a left over washer. 150ft lbs Good luck

 

It IS possible, as the oil pump gear is prevented from spinning on the crankshaft by friction only. When you were mounting the crank bolt, the end of the crank shaft should be recessed with respect to the face of the balance gear on the crankshaft. I don't remember 'recessed by how much', I think it was about 2 mm or so.

 

This has to be one of The classic Porsche engine assembly problems.... Its an easy fix though. You can (probably) confirm it by looking down on the power steering pulley, while the engine is running - if it's wobbling, then you've found your problem...Bruce ;]

 

Crank pulley will get you all those lights.

 

Thanks all, that was it. The power steering pulley was wobbling a little bit, and I was able to loosen the bolt again without too much pressure on the breaker bar. It's kind of strange becuse I know I torqued that sucker down to 154 lbs (with loctite) the first time. So I torqued it down again and confirmed I had oil pressure. I'll check it a couple of times before I venture too far.

 

I either don't remember it properly, or this is different for models with no power steering (mine, 1983). In my case, tightening the crank bolt on the recessed crankshaft allowed squeezing all parts on the crankshaft, so that they don't spin.
In the picture above (which doesn't look like what I remember), there must be other parts that allow to mount things tight. Otherwise, the sprockets would just move along the axis of the crankshaft... Maybe there was a washer; I don't remeber.