FE350 ENGINE
Piston and Connecting Rod
2001 Pioneer 900 Gasoline Vehicle Maintenance and Service Manual Page 13-27
13
When the engine is cranked by the starter, a tapping noise will be heard while the ACR is in an open condi-
tion. It is a normal function of the ACR to click, or tap, as the engine cranks at a speed below 700 RPM. After
the engine starts and begins to idle, the ACR will close and the tapping noise will stop.
If the ACR fails to hold the valve open during the cranking function, the engine will have too much compres-
sion and may not turn over when the starter is activated. If the ACR fails to allow the exhaust valve to close,
the engine will not reach full compression and will not have complete acceleration power. The return spring is
the only serviceable part on the ACR. The ACR is a component part of the camshaft assembly and as such,
if the ACR fails, the camshaft assembly must be replaced.
PISTON AND CONNECTING ROD
Read DANGER and WARNING on page 13-1.
NOTE: The connecting rod and cap must stay together as a set. Do not mix with parts from any other
engine.
Piston and Connecting Rod Removal
1. Turn crankshaft to expose the two connecting rod cap bolts (1) (Figure 13-51, Page 13-27).
2. Loosen the cap bolts and take them out together with the connecting rod cap (2).
3. With cylinder head removed, push the piston/connecting rod assembly out of the cylinder.
Piston and Connecting Rod Separation
1. Remove two retaining rings holding the piston pin in place.
2. Remove the piston pin.
Piston Inspection and Repair
1. Remove all deposits from the piston.
2. Clean the carbon from the piston ring grooves. See following CAUTION.
Figure 13-51 Connecting Rod Cap Bolts
Figure 13-52 Measure Piston Ring and
Groove Clearance
1
2
