18
ENGINE
165
18.4.16 Measuring the piston/cylinder mounting clearance
302699-10
–
Check/measure the cylinder. (
–
Check/measure the piston. (
–
The smallest piston/cylinder mounting clearance equals the smallest cylinder bore
diameter minus the largest piston diameter. The largest piston/cylinder mount-
ing clearance equals the largest cylinder bore diameter minus the smallest piston
diameter.
Guideline
Piston/cylinder - mounting clearance
Size I
0.025… 0.047 mm (0.00098…
0.00185 in)
Size II
0.027… 0.049 mm (0.00106…
0.00193 in)
Wear limit
0.070 mm (0.00276 in)
18.4.17 Checking the piston ring end gap
302704-10
–
Remove the piston ring from the piston.
–
Place the piston ring in the cylinder and align with the piston.
Guideline
Below the upper edge of the cylinder
20 mm (0.79 in)
–
Measure the end gap with feeler gauge
.
Guideline
Piston ring - end gap
Compression ring
≤
0.40 mm (
≤
0.0157 in)
Oil scraper ring
≤
0.80 mm (
≤
0.0315 in)
» If the end gap is greater than the specified measurement:
–
Check/measure the cylinder. (
» If cylinder wear lies within the specified tolerance:
–
Change the piston ring.
–
Mount the piston ring with the marking facing toward the piston head.
18.4.18 Changing the camshaft bearing
308666-10
–
Clamp special tool
into a vise.
Adjustment bush bridge (77229050044) (
–
Mount the camshaft on the special tool.
–
Remove screw
.
302767-10
–
Pull camshaft gear
off of the camshaft.
Extractor, camshaft gear (77229001044) (
–
Remove bearing
.
–
Oil the new bearing
and push it onto the camshaft.
Lubricated with engine oil
–
Degrease the cone of the camshaft and camshaft gear.
–
Mount camshaft gear
.
Summary of Contents for 350 EXC-F SIX DAYS EU
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