DESCRIPTION AND OPERATION
Page 35
29
Figure 29 — Bottom Rotators
Valve Stem Seals
The seal introduced with ASET™ engines is
smaller than the previously used seal. This seal
requires a new valve guide that is approximately
1/8 inch (6.35 mm) smaller than the previous
guide and seal to allow clearance for the inner
valve spring used on the exhaust locations. For
standardization purposes, the new valve guide
and seal are used at inlet locations as well.
30
Figure 30 — Valve Stem Seal (Later Design)
Spring-Loaded Push Rods
All ASET™ engines are equipped with
spring-loaded push rods at the exhaust locations,
the same as those phased into production on the
E-Tech™ engine. These push rod assemblies
have a spring at the rocker arm end, and are
designed to keep the roller lifter in constant
contact with the cam. Additionally, this push rod
design reduces valve clatter that results from the
engine brake camshaft exhaust lobe clearances
and operating dynamics of the exhaust valve
train. The spring-loaded push rods are currently
used at the exhaust valve locations only.
1. Rotator for Dual Springs
(Exhaust Location)
2. Rotator for Single Valve
Spring (Inlet Location)
1. Steel Retainer Band
2. Multi-Lip Section
3. Blowback Lip
4. Valve Guide
5. Three Sharp Ridges
5-111.bk Page 35 Monday, July 10, 2006 2:26 PM
To Next Page
Loading...
