Series 4180 Powerhead44
If air is escaping at the cylinder inlet/exhaust ports or
around the pushrods, the cause may be:
– Carbon deposits on inlet/exhaust valve
– Worn piston rings
– Seized piston
16.4 Testing Compression Pressure
N Remove the cover, @ 4.3.
N Pull boot (14) off the spark plug.
N Unscrew the spark plug (13).
N Screw the compression tester 5910 850 2000 (25)
into the spark plug hole.
N Pull rewind starter firmly and quickly several times.
N Read compression pressure on pressure gauge.
Specification: 6 – 7 bar
If compression pressure is less than6 bar, check valve
clearance, @ 15.3.
If valve clearance is correct, check cylinder, piston and
piston rings for scores and damage.
16.5 Installing New Oil Seals at Starter Side
N Remove the shroud, @ 4.2.
N Remove the rewind starter, @ 5.2.
N Fit the locking screw 4282 890 2700 (25).
N Turn the crankshaft counterclockwise until the piston
butts against the locking screw.
N Unscrew the nut (3) and remove the starter cup (4).
N Apply puller 5910 890 4400 (1) with No. 3.1 jaws to
oil seal (5) and clamp the arms.
N Pull out the oil seal (5).
N Push the installing sleeve 4112 893 2400 onto the
crankshaft.
N Lubricate lips of oil seal (5) with multipurpose grease.
N Push on the oil seal (5) with its open side facing the
crankcase.
N Use press sleeve 1115 893 4600 (32) to install the oil
seal (5).
16.6 Installing New Oil Seals at Flywheel Side
N Remove the shroud, @ 4.2.
N Remove the fan housing, @ 7.1.
Interactive video "Testing Compression
Pressure"
0000-GXX-2363-A0
25
0000-GXX-1966-A0
30
0000-GXX-1951-A0
31
0000-GXX-1952-A0
32
5
0000-GXX-1954-A0
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