Got a comet with a busted big end ? try this it ain`t rocket science !!!
Main tools you will need : A Lead Hammer
Hydraulic press
Truing Jig
Vice and various spacers.
Beg steal or borrow all of these ,if this is not possible hit the DELETE button now .
Pic 1 and 2 show the Dollies needed I used 3 but 2 will do . the long one is to hold the whole assembly in the vice to stop any turning while undoing the nuts.
Pic 3 and 4 show the spacers needed to push the Small end and the outer race into the Rod.
Pic 5 and 6 show the whole assembly in the vice.
Pic 7 " jacking screws " to open up the wheels while still in the vice. 3 off and open up the wheels very slowly.
Pic 8 shows the wheels apart.
Pic 9 shows a shaft being checked for true BUT leave well alone since this will mean a extensive machining operation and to coin a phrase "if it ain`t broke etc " The truing jig will only use the bearing surfaces close to the Fly Wheel .
Pic 10 shows the Pin and Thrust washers - if these are blue or scored turn them round and use again.
A point to make here is that when pushing in he new pin is that the oil delivery hole is at a 11 -o-clock position relative to the Con Rod ( at Top Dead Center ) .This is so that the rollers get a dose of cold ,thick oil before the big push. there is some debate as to this , some say it is not important .
Pic 11 shows the truing jig -your Fly wheels when together will sit in the four rollers and be close up to the Flywheel edge The rollers will simulate the Main Bearings .
Finally , and this is the best bit ,mark the max run out and then bash that spot with your Lead Hammer - it will take several goes but when all is correct the Max run out will be 0.0000 at best and 0.002 at worst.
Pic 12 shows 4 sets with a best run out reading of 0.0005 and 0.0015 worst.
Torque the nuts down to the specified value as per the instruction sheets ( 150 Ft Lbs ? )
Main tools you will need : A Lead Hammer
Hydraulic press
Truing Jig
Vice and various spacers.
Beg steal or borrow all of these ,if this is not possible hit the DELETE button now .
Pic 1 and 2 show the Dollies needed I used 3 but 2 will do . the long one is to hold the whole assembly in the vice to stop any turning while undoing the nuts.
Pic 3 and 4 show the spacers needed to push the Small end and the outer race into the Rod.
Pic 5 and 6 show the whole assembly in the vice.
Pic 7 " jacking screws " to open up the wheels while still in the vice. 3 off and open up the wheels very slowly.
Pic 8 shows the wheels apart.
Pic 9 shows a shaft being checked for true BUT leave well alone since this will mean a extensive machining operation and to coin a phrase "if it ain`t broke etc " The truing jig will only use the bearing surfaces close to the Fly Wheel .
Pic 10 shows the Pin and Thrust washers - if these are blue or scored turn them round and use again.
A point to make here is that when pushing in he new pin is that the oil delivery hole is at a 11 -o-clock position relative to the Con Rod ( at Top Dead Center ) .This is so that the rollers get a dose of cold ,thick oil before the big push. there is some debate as to this , some say it is not important .
Pic 11 shows the truing jig -your Fly wheels when together will sit in the four rollers and be close up to the Flywheel edge The rollers will simulate the Main Bearings .
Finally , and this is the best bit ,mark the max run out and then bash that spot with your Lead Hammer - it will take several goes but when all is correct the Max run out will be 0.0000 at best and 0.002 at worst.
Pic 12 shows 4 sets with a best run out reading of 0.0005 and 0.0015 worst.
Torque the nuts down to the specified value as per the instruction sheets ( 150 Ft Lbs ? )
