Millhaus

Rebulding my 1980 930 I found a pitted lobe on the camshaft with what looks like small cracks where the pit came out. They need welding or replacement.

I am sending them out for an expert opinion but is it common to weld and reharden camshafts with good success? Can they be welded and recut into a SC profile?

Thanks

Geoffrey

Buy new camshafts. While you can have cams reparied and reground into other profiles (within reason), it really is not worth it.

jim dorociak

I had some 4 journal late model cam cores with one bad lobe reground and made to my specifications and spent $500 as I remember, but I supplied the cores. Webcam in Riverside CA. did the work and they are an excellent company to do business with. Jim

Metal Guru

Why not?

jim dorociak

In fact I have heard an even better cam profile besides the SC grind is the 964 stock grind - possible to find used cams needing no work for $375- $450 range. I am not the turbo guy, but I am sure many here or in the engine rebuilding forum at Pelican Parts can steer you in great directions. Jim

kens911

Stock 964 cams do not work there is no turbo scavenge drive on the drivers side cam and there is a power steering drive on the end of the passenger side cam.

JFairman

Actually you can make stock 964 cams fit and work in a 930 motor by cutting off the power steering drive on the passenger side cam and then modifying the driver side turbo scavenge pump drive and surrounding sheet metal to mount up without the 930 air pump pulley/spacer by using steel roll pins in the two holes in the end of the cam for the oil pump drive.

If the 930 engine mounted oil cooler has been removed and exchanged for a 993 type spin on oil filter housing you could also remove the pressed in steel plug from the end of the passenger side cam tower and install the same oil seal that is used on the driver side cam tower in place of it and just leave the power steering drive in place doing nothing.

Several ways of doing it and most people have the air pump pulley/scavange pump drive welded onto the driver side cam and the passenger side power steering drive cut off the end of the passenger side cam for around $50.

Geoffrey

Like I said, might as well buy a new camshaft with the proper drives.

jim dorociak

Geoffrey - the final word. Jim

Metal Guru

Seems to me regrinding one's own camshafts avoids the issues regarding what to do about these drive noses; some wanted, some unwanted.

pdqcarrera

http://www.webcamshafts.com/pages/au..._sohc_12v.html

Steve Weiner-Rennsport Systems

We've used Webcam for re-profiling these camshafts (welding and hardening) 20+ years without an issue. Naturally, one MUST use new or refurbished rocker arms and break them in with the proper oil and procedures for a successful outcome.

In many cases, its a money saver.

JFairman

Webcam regrinds are in my car working well too.
grind #40 - 964 profile.