Adam Geist

Loctite 574 is the sealant to be used on the cam bridge. I paid $20 for a 50ml bottle last year at the Hershey, PA Porsche event.

I agree with Mrmerlin on using Yamabond. Last weekend we used Hondabond 4 on Mike Fyre's cam cover gaskets. From what I understand, Threebond makes Hondabond, Yamabond, etc. Hondabond 4 is the same as Threebond 1194 (lead-free) or 1104 (no longer available do to lead content).

FYI - Threebond/Hondabond/Yamabond can be found at your local motorcycle/ATV/waverunner store.

AO

Big Dave has a nice big tube of hondabond. So no worries there.

Big Dave, let us know when you're going to do this and we can come and help again.

aggravation

Thanks! I'm on my way to the Yamaha dealer right now.
I was going for the black RTV because it says it's good for oil exposure use but I'll defer to your experience over product package marketing any day!

Mike Frye

Dave,

For the parts list, I'd get:

Cam cover gasket
Cam cover O-rings (9 small for bolt holes and 2 larger for the breathers, per side)
Also, get a set of the small washers that are part of the tech bulletin (thanks Bill Ball)
The update says 12 per engine, I used 12 per side (all bolts) to give the cam cover gasket that little extra pressure all around. Roger has them.

aggravation

How do you loosen number 37 and 38 in that parts diagram? I tried bending the tab that is locked into the nut but even with it disengaged from the nut it acted like it wasn't going to turn..
A special kind of wrench to get a grip on it or something?

AO

I used a big needle nose pliers to grab the nut and the stuck a big screw driver between the handles and gave her a twist.

Big Dave

WITH THIS

Mike Frye

Cool!

Mrmerlin

I too have had good luck with adding the sealing washers to all of the cam cover bolts, and the 574 loctite should be used to seal the cam caps first then the yamabond on the gasket and at the cam cap to head surface

Tails

Had similar leak and stopped leak by fitting 0.70mm aluminium washers under cam cover securing bolts, between head and metal "O" ring cap to apply more compression on joint seal and "O" rings. IIRC, 26 washers required. They are displayed in PET.

Tails 1990 928S4 Auto

Fogey1

http://www.threebond.co.jp/en/product/number/index.html
'Course, I couldn't find a "where to get it" link. So ... thanx, Adam.

backnblack

Hey Dave when are you going to get into this ? I would like to come by and see it all apart.

Big Dave

UPDATE...well, 48% of you were wrong.

I replaced the cam cover gasket today (I HATE getting at the bottom cover bolts), drove it around the block and saw oil drips again.

I was going to reseal the cam bridge at the same time until I realized the belt and cam gears need to be off to remove the bridge. I get to pull off the cover (again) and then re-seal the bridge and replace the o-ring. I just ran out of time today.

BC

I said it was a pressurized seal, and I think I am right.

Landseer

I need to know how you fixed this, Big Dave!

Got something similar happening on an 86, and figure I need to go in deep.

Any pointers on this?