Shark_Week

first off i'm looking for two usable 32v cam pulleys if anyone has them . when i finally track them down, i understand they are aluminium and need that coating. is it a hard anodized coat or what is it exactly. just wondering what to ask the metal coating shop. also is the oil pump pulley aluminum? and since the crank timing gear is steel does that require the same coating? thanks in advance

namasgt

crank timing gear is steel, no coating.
oil pump gear, some are steel and some are aluminum. one of my oil pump gears was aluminum and it had the same coating and color as the aluminum cam gears. But the other engine I had, it was steel, dark gray color.put a magnet on it.

namasgt

for coating, this is the only one Ive seen, usually they change them

http://members.rennlist.com/bigdave/tbelt7.html

this person did have a T-belt failure, it may be of good help.

Shark_Week

thanks namasgt, hoping to find some cheap but may need to buy new. also need the oil pump pulley

Hilton

The aluminium oil pump pulley was factory original - the steel one is a factory replacement part (not sure which year they introduced the steel part - there's a service bullein somewhere about replacing it).

When replacing the aluminum one with the steel one, make sure you leave the shim off too - the height of the boss in the center of the steel oil pump gear is different.

Shark_Week

very good, thanks xlot

Rob Edwards

And if you're going to re-coat the cam gear, read posts 28-40 in this thread:

https://rennlist.com/forums/928-foru...r-updated.html

Cliff note: Make sure you remove the coating from the face of the gear that contacts the cam.

Giovanni

I got a used one from 928Intl a few months ago. It was in great condition, better than expected and I think it was only $50.

Stromius

Martin - I had mine refinished at at finishlinecoatings.com in Oregon. I was very satisfied with the results.

Shark_Week

thanks for all the good info guys!

danglerb

I wish we had some longer term info on coatings, as it is, I'm not sure its worth the risk not to use a new factory gear.

AO

On the red GT, I've got over 15k miles on my re-coated gears (on a supercharged motor) and so far all looks good (last inspected in the spring). After I get the '87 up and running, I plan on doing a TB inspection on the GT and will note the condition at that time.

If you are going to have this done, do not let the coater dip the gears in an acidic bath. The acid does not react well with the magnesium in the cam gears and will literally melt them.

Big Dave

I've got over 20K miles on my re-coated gears. They still look great.

Fabio421

Yep. Heinrich tried this a few years ago and the pictures would horrify you. Be carefull.

blown 87

I do not need to see any pictures to be afraid, you guys are scaring me enough using old, worn, cam gears.
That is a big gamble over 250 bucks worth of parts, if one fails it is going to be expensive.