the flyin' scotsman

As part of the valve cover gskt replacement project I decided to include replacing the cam timing chains and the tensioner pads.

I just viewed the cyl head removal/install video and notice they use a special tool for cam removal...........are the tools absolutely necessary?

If so, anyone out there have a set I can borrow?

joejoe

I used no special tools when I did my 86.5. For reinstall there was a cam indexer that I could not find anywhere so I just lined everything up where it was previously. To do this you need to mark everything before taken off. There may be differences for an '88, but I do not know.

jcorenman

Malcom,

Try this thread for info:
https://rennlist.com/forums/928-foru...tructions.html

I think you can also just back the bearing-caps off evenly, one turn at a time-- the goal is to lift the cams evenly to avoid tilting (and jamming) the flanged bearing.

Cheers,

Schocki

Have not done this on my GTS but on my 944 S2. There is no special tool needed just be careful and go on turn at a time with the bearing caps. The bearing caps are numbered BTW, I would still mark them...

the flyin' scotsman

Thx for the inputs.........given the WSM and the Jim Moorhouse video the cams are turned to TDC for removal with the crank at 45 BTDC so there's no fear of valves meeting pistons.

Cam removal has a proceedure with some caps coming off prior to the others which can be done as described 'one turn at a time'.

fraggle

I JUST did this procedure. I built my own set of 9226 tools from some 1.25 square stock from home depot and bolted it through the cam cover holes. I felt a lot better about things and it only cost me $20 for the bolts and brackets. Check my thread : https://rennlist.com/forums/928-foru...erheating.html - you actually just posted to it a couple days ago. I have some links in there from other threads for home -bodged tools for this.

BE very careful with that flanged bearing. I pulled the cams on my wife's volvo without it and broke some bits off the head - not enough to kill it but I wasn't happy with myself.

the flyin' scotsman

Thx much................guess I didn't read far enough back in your thread.........I'll go re-look.

ok..........I see a pic of an engine on a hoist but nothing dismantled; did I miss it? ok post #73 talks to a home made tool; any pics please?

the flyin' scotsman

Search was my friend...........I found a recent thread re. discusson of whether to R&R the cam chains.

I believe the m/cycle discussion went a little left field; most multi cyclinder m/cycle engines drive the cams by chain (I said most so.....) and these chains are quite long compared to the 928 and are a wear item as are there tensioner 'pads'.

I'm gong in to fix a leak so WIAI I'll replace the chains and tensioner pads.........the special tool is not feasible from a cost perspective...........appreciate insights.

fraggle

Sorry, my digital camera broke on me so no new helpful pics will be available. Can't replace the camera because I need the funds for 928 parts!

Here are some shots I used to base my homebrew 9226.

https://rennlist.com/forums/928-foru...tructions.html

the flyin' scotsman

Thx.......that was the thread I found that had good discussion on replacing or not the cam chains.