Just returned from a trip to Bend, Oregon, driving
our L-21 P12 Coach...Drove it 400 miles and used
40 gallons of gas..not bad mileage. But I had to
get it back to the Paint Shop right away and...
Type: Posts; User: Steady Eddie; Keyword(s):
Just returned from a trip to Bend, Oregon, driving
our L-21 P12 Coach...Drove it 400 miles and used
40 gallons of gas..not bad mileage. But I had to
get it back to the Paint Shop right away and...
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,...
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...
I found a Web-site that claims the L21 has a
forged steel crankshaft. Same as a Marine 454
in a boat. The crank's GM Part # is 14096983..maybe
also forged rods..I am busting my buns on this
end...
When I type in our P12/L21's VIN at ACDelco.com
it tells me it has an engine code of "B"...
but some of the parts shown are not L21
specific..for some examples: It shows a
distributor rotor (L21s...
Our VIN and Build Sheet is over on the Diesel
Place/Duramax Forum in the Vin Request Sub
Forum. Look for a request from Steady Eddie.
If you see a Motorcoach, of any Brand name,
that looks as...
Well, the two engines ARE different. If you go
to the Mr. Goodwrench Crate Engines Web-site
you will find the L21 listed on page 4 and GM
calls it there a "performance" engine, whatever
that...
I think we both need to look at the camshaft specs
and compare the L21 to the L29..I can't find the
numbers on lift and duration for the L21 camshaft
anywhere online..odd..my L21 has 405 ft.lbs....
Our P12 is now 30 miles away, at a body shop.
When we get the Coach home, I can get
to the PCM easily. It is bolted to
the driver's side radiator frame, right on top.
I can get you the numbers....
I've got one. Let me know if I can help.
Steady Eddie
L21/Allison