quote:
Originally posted by Kestas:
The small block Ford V8 uses nylon coated teeth on the timing gears for quiet operation.
That seems to only be true for non-HO 5.0 engines.
According to information on
http://www.corral.net the HO 5.0 engines use a double-roller timing chain with steel gears.
I also looked in the Office Ford Mustang 5.0 Technical Reference and Performance Handbook by Al Kirschenbaum and it says:
All 1979 5-liter and 1980 4.2 liter V8 engines were assembled with a plastic-coated aluminum cam-drive sprocket and a .75 inch wide Morse link type silent timing chain.
In 1982-1994 Mustang 5.0s, an .875 inch wide roller timing chain replaced the previous link type chain. This double roller arrangement had originally been developed for industrial engines and was first used in 1980 Ford 5.8 liter police car applications.
[...]
The roller timing chain setup remained in 5-liter V8 production through 1994. At the very end of the 5-liter Fox-4 Mustang run, the roller chain was replaced by a pinned-link silent timing chain that cost Ford less to use. This 1995 and later 5.0 chain is similar in design to the silent chain used in pre-1982 Mustang V8s and can replace the pre-1982 chain or the 1983-94 chain if replaced as a set with the two sprockets.
12.2 Sprockets
The corresponding cam socket was redesigned from the earlier 4.2/5 liter's plastic coated aluminum verion to a double row, straight toothed Grade-A cast iron version for the double roller chain.
[...]
(When the silent chain design returned to 1995-and-later 5-liter V8s, the cam sprocket did not come with the plastic coated teeth used on pre-1982 V8s)
[ November 03, 2004, 10:01 AM: Message edited by: brianl703 ]