1989porsche928

I recently put on my valve covers after getting them powder coated, I started it up today and theirs a lot of chattering going on on the passengers side valve cover. I also replaced the Hall Sender Unit. Do you think I installed the Hall Sender Unit Wrong? Is that possible? As the RPM gets faster the noise gets faster. Thanks

MainePorsche

When you had the cam cover off, do you recall what you had under the bridge at the aft end plugging the journals (oil galley holes) ? A journal pin (which is the current superceded part) or the journal plug (old part) ? The images show each. The other image shows what it looks like with a plug in (Right) and plug out (Left). If those journals are open you will lose oil content up top - most common cause of tappet chatter.

1989porsche928

I can't remember. I remember looking to see of the caps were warped or burnt but I thought they looked fine.

MainePorsche

When you say caps, you mean outer cam covers ?
These journal plugs or pins are internal to these.
The status of the journal plugging/pinning is crucial - you may have to take a look.
What oil are you using ? Makes a difference so oil can get up top, especially on start up.

1989porsche928

Should have originally posted this, I had to remove the spark plug wires. I bought the Nology wires a couple years ago. When I touched some of their ground straps when the car was on it shocked me. Also I hear a sucking sound (not from the spark plug wires)

1989porsche928

I never removed the caps. So you want me to remove the valve cover again and remove the caps? Do these pins normally go bad after your remove the valve covers? The car has been sitting for a couple weeks and it still made the noise after I drove it for 30 minutes. I am using AMSOIL European Oil Mid SAPS.

MainePorsche

You may have a vacuum leak - seating of the manifold/throttle body/large vac line ?

NO, don't remove the cam covers. You can inspect the journal plugging just by removing the valve cover (see above image). If you have to place the pins there, you will have to remove the bridge and then reseat the cam covers.
Is that oil 'heavier' than a 15-50 ? If so, it may be having difficulty 'pumping up' to the cams on start up.

And: removal of the valve covers should not affect the journal plugs/pins.

MainePorsche

Plugged oil check valve can be a cause too, but displaced journal plugs more likely. You won't know till you look and confirm.

dr bob

Without running the engine again, pull that cover off and see what's inside. Related: While the covers were off, did you replace the wear pads for the chain tensioner? If so, verify that it's still in place, and that the little oil feeder tube is intact.

Many (including me) stuff the oil return galleys while the covers are off. Several (including me) have pulled the cam covers after reading the big note on the assembly table that reminds us that the galleys still have towels in them. Are there rags/paper towels/whatever still in there to prevent parts from migrating down to the sump?

By mid MY1989, the oil cap plugs in the cam bearing caps were changed to pins IIRC. Mine has pins.

1989porsche928

So I basically just take the valve cover off. I hate when this happens I have to be away from my car for two weeks knowing something is wrong. Do I only clean one check valve. So theirs 3 caps total I need to inspect or replace?

ammonman

My 1990 had the old style rubber pucks/pins. Don't remember the build date of the top of my head.

Mike

1989porsche928

thanks for the responses, i will take some photos of the cover when it is taken off. Hey do you guys know if their the new Hall Sender Unit could be causing the noise? thanks.

davek9

Not unless it's loose, you should be able to tell from outside.

Rob Edwards

Not unless it's the wrong Hall sensor or the rotating sensor actuator plate (called a Rotor Trim in PET..) is bent in some way that it's contacting the tip of the sensor.

The Hall sensor shouldn't be making contact with anything.

1989porsche928

I leave on the 11th for 2 weeks, today I just had to take the cover off again and upload some pictures must be some car excessive compulsive disorder