No help from the GM P12 Service Manuals..
Dammit--
There are no Part Numbers in my three-volume
P12 Chassis Service Manuals (?).
I thought I'd just "cut a fat hog" and simply look
up the crankshaft in the book..no such luck.
My Chevy Stealership, in the Parts Department,
does have some, if not all, of the P12 info on
their computer, I've seen the exhaust system
parts breakdown pictured and it is a P12 specific
set of parts. No other GM Chassis has it.
Part of "our" problem is due to the rarity of the
P12/L21 motor combo. I can't even find out
if there was a P12 made in 1999.
There exists a 1999 P12,
one volume (thick) Service Manual--
I've seen them for sale on eBay. But whether or
not GM ever actually produced any, I can't find
out. In the late fall of 1998, GM sold the rights
to the P30-series MH Chassis to Workhorse Custom
Chassis (WCC)--they did not sell the rights to the
P12, WCC had to copy GMs lead, and WCC finally
came out with their own version, around 2000,
they had the W22 about then..all 8.1 L Class A
motorhomes are on a Workhorse chassis.
Still coming up blank on the forged or not L21 Crank...
but it makes sense to have one in a Medium Duty
truck engine.
Steady Eddie
Why the P12/L21 FSM ain't so popular..
The Manuals aren't popular because of the rarity
of the P12/L-21 combo. I Moderate a Yahoo! Group:
The P12 Chassis Group, and I have but 8 Members,
it is a discussion group for Owners of the P12,
and I find that no one knows of the P12, they may
have walked right past one in a Campground, but
did not know what to look for. You all are invited
to come over and sign up...and look at the Photos
and Files Sections..it is free, and like the Plug Mod,
free is a very good price...
Steady Eddie
