Table of Contents
Advertisement
Group 21 Engine Body
126
Plus d'informations sur : www.dbmoteurs.fr
Inspect and adjust timing gears
After installing the timing gears, be sure to inspect
and adjust them as follows.
Inspect timing gear backlash and end play
After installing the timing gears, inspect the backlash
between the gears in mesh, and the end play of each
gear.
Inspect Valve Timing
It is not necessary to inspect the valve timing, provi-
ded that all match marks on the timing gears are
aligned. Inspect the timing for verification as ex-
plained below.
Valve timing diagrams
A. Standard
B. with 2 mm [0.08 in.] valve clearance added
1.
Inlet valve opens
2.
Inlet valve closes
3.
Exhaust valve opens
4.
Exhaust valve closes
Use a feeler gauge 2 mm [0.08 in.] thick, add 2 mm
[0.08 in.] clearance to the inlet and exhaust valves of
the No. 1 cylinder. Then insert a feeler gauge 0.05
mm [0.020 in.] thick between the bridge cap and rock-
er. Slowly turn the crankshaft to find the position
where the feeler gauge is firmly gripped (the valve
starts opening) and the position where the gauge is
released (the valve starts closing). Check that these
positions coincide with the angular positions shown in
the valve timing diagram B.
Install the timing gear case
1. Apply sealant to gear case surface. Mount the
packing. Apply sealant to packing.
2. Replace dowel pins if worn, or if gear case has
been replaced.
3. Tighten gear case mounting bolts evenly to the
specified torque. Cut off excess packing along
the edge of the crankcase.
4. Apply engine oil to the oil seal lip. Insert seal (2)
into timing gear case(1).
5. Fit oil seal to slinger (3) to a distance of 15.7 –
16.3 mm [0.588 – 0.612 in.](A) using the Rear
seal installer.
Advertisement
Table of Contents
