F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
5 - M
AINTENANCE
PAGE 5-21
below flush of the thrust faces, no more than 1/3 of the oil passage hole in the rod can be
covered by the bushing.
CAUTION!: DO NOT TOUCH COLD SURFACES WITHOUT PROPER INSULATION TO
PREVENT INJURY. ALCOHOL IS FLAMMABLE AND SHOULD ONLY BE
USED IN OPEN AIR OR A WELL VENTILATED BUILDING. AVOID SPARKS
AND OPEN FLAME. AVOID ALCOHOL VAPORS WHICH MAY CAUSE
INJURY TO THE TISSUES OF THE NOSE AND EYES. AVOID EYE AND
SKIN CONTACT. USE NEOPRENE OR BUTYL GLOVES, MONO-GOGGLES
OR FACE-MASK AND IMPERMEABLE APRON. IT CONTAINS METHYL
ALCOHOL AND IS POISONOUS IF INGESTED. SEE MANUFACTURER'S
MATERIAL SAFETY DATA SHEETS FOR MORE INFORMATION. DO NOT
RETURN SOLUTION TO A CLOSED CONTAINER UNTIL IT HAS REACHED
ROOM TEMPERATURE OR THE CONTAINER MAY EXPLODE.
NOTE: ABSOLUTE CLEANLINESS IS REQUIRED. ASSEMBLY MUST BE IMMEDIATE
SO THAT THE BEARING DOES NOT WARM-UP AND STICK BEFORE IT IS IN
PLACE. DO NOT SEAT A STUCK BUSHING WITH A PRESS OR HAMMER.
Main Bearings - Removal and Installation w/Crankshaft In Place
NOTE: REPLACE ONE MAIN BEARING AT A TIME. REMOVE THE CAP ON THE
BEARING BRING CHANGED, CHANGE THAT BEARING AND REPLACE THE
CAP AND TIGHTEN THE BOLTING PRIOR TO STARTING THE NEXT BEAR-
ING.
1.
Follow instructions in "CAUTION" on Page 5-2. Remove coupling spacer or oth-
erwise lockout.
2.
Remove the top cover.
3.
Remove the cap screws from main (journal) bearing cap #1. Pull the cap straight
up to prevent damage to the dowel fit. If the cap is tight, use a Bearing Cap
Puller as illustrated in Figure 5-13 on Page 5-17.
4.
If necessary, attach clean nylon lifting straps around the crankshaft and lift
slightly to take some of the weight off the bearings and allow for easier disas-
sembly of a bearing shell.
5.
Remove the shell from the main bearing cap. Remove the main journal bearing
shell from under the crankshaft, by rotating out. Start rotating the shell under the
crankshaft tab side out first, by pushing or tapping with a non-metallic tool on the
opposite split face side. Once the bearing shell is completely loose, use pur-
chased separately Main Bearing Pusher Removal Tool (part number G-10706 or
may be made from prints supplied by Ariel) to push out bearing shells, see Fig-
ure 7-2 on page 7-3. Once started the shell may be rotated out, by releasing the
lifting straps and turning the crankshaft. Be careful not to damage the crankshaft
bearing surfaces.
6.
Clean and dry main bearing cap to bearing surfaces.
7.
Check the new bearing shells for handling damage, scratches, burrs, and loose
material at the tab.
DO NOT RUB BEARING SURFACE WITH FINGERNAIL
.
The bearing shells must be absolutely clean. Install new bearing shells in cap,
and frame journal, properly located in the tab notch, (rotate in the untabbed end
first), keeping the backs of the shells dry and clean.
