I need a diagram of timing chain replacement Thank You
During most engine rebuilds, a completely new timing assembly should
be installed. If wear exists on any component, replacement of the entire
assembly is necessary. Wear in the chain, gears, or sprockets means a
timing lag, which results in poor engine performance.
The timing chain or belt is generally installed with the gears in
their correct positions. Before installing a new chain, soak it in oil.
OHC (Overhead Cam) Engines
Some OHC engines use a chain drive; others use a belt drive. Removing
the cover on some OHC engines that have timing chains is more
difficult, because the cover often fits between the oil pan and the
cylinder head. There are special procedures for replacing cam timing
components in these engines.
Before a chain repair job, perform a leakage test on non-freewheeling
engines to check for bent valves, so that an accurate repair estimate
can be made.
OHV (Overhead Valve) Pushrod Engines
On many OHV pushrod engines, the crankshaft sprocket is installed on
the crankshaft nose and the crankshaft is rotated to position piston #1
at TDC. At this point, a mark stamped onto the crankshaft sprocket is
pointing directly upward (toward the camshaft).
The camshaft sprocket is then temporarily bolted to the cam and used
to rotate the cam until a mark stamped on the cam sprocket is pointing
directly downward (toward the crankshaft). The sprocket is then removed
from the cam (without allowing the cam to rotate).
The timing chain is looped over the cam gear, the mark on the cam
gear is positioned directly downward, and the chain is looped around the
crankshaft sprocket. When the cam sprocket is attached to the cam, the
timing marks on the crank and cam sprockets should be pointing toward
one another. NOTE THIS IS FOR 2WD 4.0
May 22, 2010 |
2005 Nissan Pathfinder