Cleaning Connecting Rods; Crankshaft - Mariner 30 JET 40 (4 CYL) Service Manual

Cleaning Connecting Rods

1. If necessary, clean connecting rod bearing sur-
faces, as follows:
a. Install connecting rod cap and bolts (using
1/4"-12 point socket). Be sure that cap is
aligned with rod correctly. Refer to connect-
ing rod cap alignment, following.
b. Clean CRANKSHAFT END of connecting rod
by using 320 CLOTH placed in a slotted 3/8"
(9.5mm) diameter shaft, as shown. Chuck
shaft in a drill press and operating press at
high speed while keeping connecting rod at a
900 angle to slotted shaft.
IMPORTANT: Clean connecting rod just enough
to clean up bearing surfaces. DO NOT continue
to clean after marks are removed from bearing
surfaces.
4-30 - POWERHEAD
c. Clean PISTON PIN END of connecting rod,
using same method as in Step "b", preceding,
using 320 grit carborundum cloth.
d. Thoroughly wash connecting rods to remove
abrasive grit. Recheck bearing surfaces of
connecting rods. Replace any connecting
rod(s) that cannot be properly "cleaned up."
Lubricate bearing surfaces of connecting
rods (which will be re-used) with light oil to
prevent rust.

Crankshaft

1. Inspect crankshaft to drive shaft splines for wear.
(Replace crankshaft, if necessary.)
2. Check crankshaft for straightness. Replace as
necessary.
3. Inspect crankshaft oil seal surfaces. Sealing sur-
faces must not be grooved, pitted or scratched.
Replace as necessary.
4. Check all crankshaft bearing surfaces for rust,
water marks, chatter marks, uneven wear and/or
overheating. (Refer to "Connecting Rod," Step 3,
preceding.)
5. If necessary, clean crankshaft surfaces with 320
cloth.
51083
a - 320 Cloth
a
54709
90-814676R1 DECEMBER 1996