Group 21 Reconditioning engine
Cleaning, checking
C7
Clean and check cylinder liners, piston and con
rods
Clean cylinder bores to remove bright surfaces.
Remove piston rings with piston ring pliers.
Scrape out piston ring grooves.
Check for:
- damage, wear, cracks
- out-of-round gudgeon pin bores
- threads on connecting rod bolts.
13S706
C8
Measure axial play of piston rings
Use a feeler gauge.
Axial clearance, new rings:
- upper compression ring 0.045-0.074 mm
(0.0018-0.0029
in)
- lower compression ring 0.025-0.054 mm
(0.0010-0.0021
in)
- oil scraper ring (fitted) 0.009-0.233 mm
(0.0004-0.0092 in)
C9
Measure piston ring gap
Insert piston ring in bore, one at a time. Use an inverted
piston to ensure that rings take up correct position.
Measure gap with ring 15 mm (0.6 in) from lower edge.
Use a feeler gauge.
Piston ring gap, new parts measured in 88 mm (3.4646
in)
(B27)
or 91 mm (3.5826 in) (B 28) cylinder diame-
ter:
- upper and lower compression rings. 0.40-0.58 mm
(0.0157-0.0228 in)
- oil scraper ring
0.38-1.43
mm
(0.0150-0.0563 in)
Replacing damaged connecting rod bolt
Operations
CI0-11
CIO
Hammer out old bolt
Remove bearing cap and shells. Mount connecting rod
in vice protected by soft jaws.
Tap out boltwith a plastic mallet. Hold piston to prevent
damage.
28
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