rgs944

I gave up hope in getting the 5th pin out of the oil passage. I wonder if there is any harm in using 2 on each side and leaving one rubber stop in. I really do not want to wait a week before this goes back together. I wish I could understand what these are suppose to do. It is a huge change from the original setup. If I would use 4 of the new pins and one old rubber stop I wonder which would be the best to leave out.

Rob Edwards

Camshafts in the '85 and '86 32V motors are longer than the heads and use all the cam bearing surfaces. For whatever reason '87-95 cams are 'cut off' short, so they don't use the rear bearing surface. So Porsche came up with the rubber plugs and their pins to block off the oil passages to those bearing surfaces. Without the plugs, you'd have oil spewing out of those holes and lowered oil pressure. Problem is that the rubber plugs shrink over time and can fall out. So the 5 pins are there to plug those oil passages. Functionally the end result is identical to the old setup.

I want to say that there are older posts about other people having trouble getting these pins to fit. Will go look now.

rgs944

Thanks Rob, I did find a thread about the early squirter blocks having a different size pin. I guess I will use a dremel or emory cloth to work them down. If I do decide to go back together tommorow (which I really want to) and use one old plug is there anything you would suggest. I am thinking using locktight 574 in that passage before installing the old plug. It sounds like just getting the hole plugged is the main thing. Gosh, what you can learn in one miserably long day.

MainePorsche

Read that you got the pin out. Good job. I am glad for you.

MainePorsche

Posted by rgs944:
"Thanks Rob, I did find a thread about the early squirter blocks having a different size pin."

Does anyone know, are there different sized cylinder head plugs ? And if so, are they variations under the same part# or do they have there own part# ?

rgs944

I had to work the pins down. I put them in a drill and used it like a lathe with sandpaper to get them small enough to fit.

Leon Speed

Just to make sure, the loctite goes on the cam end bridge, not on the pins. Or did I read your intention wrong.

rgs944

If I had to use the old pin in place of one of the new ones I considered sealing it up better with locktite. I retreived the pin so I did not need to worry about it.

MainePorsche

With the bridge set, the pin plugs can not come out.

Vilhuer

Early '87 S4 heads have smaller oil holes that later heads. Narrow end needs to be few tenth of a mm narrower that pin is out of the bag. They have to be machined to fit.

jeff spahn

You are on the right track. Don't 574 the pins in the holes. Use the 574 on the bridge mating surfaces. Don't slather it on either. Just a small bead all the way around and you are good to go. It should just barely squish out when you bolt the bridges back down. We are talking a human hair thickness should squish out when you tighten down the bridges.
Also, don't forget to put a little bead of RTV (black or Hondabond) in the corners of each area on the head where the cam cover gasket meets the cam cover. You should have scraped off the existing RTV material before you install cam covers.
IIRC, torque on the cam cover bolts is 7 ft/lbs. Can anyone chime in here. To tight means possible broken off bolts later.

rgs944

It seemed to work well to use the drill as a lathe. I am sure machining down would be a lot more precise but we got them to fit pretty tight by just playing with them.