FE350 ENGINE
Crankcase
Page 13-26 2001 Pioneer 1200 Gasoline Vehicle Maintenance and Service Manual
13
7. If the lobe height is less than 1.3086 inches (33.24 mm) for either lobe, replace the camshaft.
8. Check the automatic compression release valve (ACR) arms to make sure they move freely and are not
binding. Clean the arms if needed. Make sure the take-up spring is properly installed. Replace the
spring if it is broken. If the arms are damaged, the camshaft assembly must be replaced.
Automatic Compression Release Valve (ACR) Inspection
Pioneer FE350 engines have an automatic compression release valve (ACR) that is activated during the
starting procedure (Figure 13-50, Page 13-26). As the engine is cranked, the ACR opens and reduces com-
pression in the cylinder, allowing the starter to turn the engine with a minimal amount of effort. When the
engine starts and accelerates, the ACR closes and full compression is reached. Because the ACR reduces
compression during the cranking cycle, starter/generator brush life is greatly extended.
The engine cranks at 550 to 650 RPM and the ACR closes at approximately 700 RPM After the engine
starts, it will idle at 1050 to 1150 RPM.
Figure 13-47 Inspect for Hydraulic Lifter Wear
Figure 13-48 Measure O.D. of Camshaft Journals
Figure 13-49 Measure O.D. of Cam Lobes
Figure 13-50 ACR Valve Inspection
1
2
3
Measure each position
in 2 places 90
°
apart.
0
1
0
2
0
3
0
0
1
2
3
4
5
6
7
8
9
10
11
40
50
60
70
80
AUTOMATIC
COMPRESSION
RELEASE
VALVE
CAMSHAFT
