348 Cam drive update

Got a buddy looking at a 91 348, on the invoice copies he sent me, lists a timing chain update done along with timing belt and top end overhaul. It lists they found the center pulley broken as the cause for the valve damage. I had not seen anything reguarding a T-chain update before, what was changed with the " update "

BTW total bill was $11,700

Thanks

Anyone?

What is the shop listed on the invoice? - it would be worth a call to get the details.

Don't know of any chains on a 348 - can you look in or undeneath to see?

This could prove to be very interesting - I might get one myself.

The oil pump and the cambelt drive are both chain driven off the crank.

Post on brand X board shows it well

http://www.ferrarichat.com/discus/me...20/237359.html

Never remember seeing anything about an update

Bob,

yes there is an update.

do a search in the archives of old Fchat, the head mechanic from Ferrari UK (Malcom?) and myself had a discussion and answered this Q for someone within the last 5 months. It does involve an update, however I was thinking it was early cars, 89-90 (91?)...didn't think it extended into the later cars.

I have heard (never seen it happen myself) that the early chains can break. Certianly couldn't be considered a common problem, but perhaps the invoice/car you have verifies it can/does happen occasionaly?

The thread we discussed this in contains part#'s and procedures I believe. Sorry can't remember the heading of the thread, something like 348 Cam Chain or Cam Drive.

Regards, JRV

JRV

Thanks, will do some more searching on the old brand X board, this is now the TOP tech board

To help with the confusion there is a timing belt that drives from the outside. Thats what most people change. There is a timing chain in the motor from the cranshaft to the shaft that has the outward timing cog that you can see from the outside of the motor above the damper

Hi BB,

not the belt/s. we're talking about the drive chain/s.