G15CSR-Current Week's DPO Discoveries
Posted: Sat Jan 29, 2011 8:13 pm
Yes the BodgeMaster 750 saga continued...with some actual questions thrown in...
Cabin Fever has set in...I have run out of bits to polish, clean, repair or condemn in the warmth and comfort of the basement Man Cave.
It got into the upper 30's today so I waded through snow about 4 feet deep out to the garage to pluck off more bits of the bike to work on. Thinking to myself about the South American Rugby Team that plane-wrecked in the Andes and had the unfortunate displeasure of feasting on their comrades remains to survive...so off to the garage to pick at my mechanical carcass
Today's goal was to pull the head....the stretch goal was to get the motor out of the cradle. The head bolts and nuts were from a DPO's variety pack...three different spanners/sockets to address them...they all came out willingly much to my amazement once I determined the size. The rear underside head bolt was altogether missing so that was one chore spared. Clearly no one worried about details like applying the proper torque to any of the head assembly nuts and bolts...
The valves have some out sort of (I think) home made spring retainers...spun aluminum disks and the split keepers on two of the valves were of different dimensions on each valve.
Let me know if these strange spring retainers are some sort of special Dunstall or some-such "performance" bits...although given the state of the rest of the bike I doubt anything fancy was considered here....akin to giving a gold pocket watch to a derelict
So I grow weary rather quickly of trying to juggle the push rods up to get the head off and I move directly to my stretch goal.....pull the motor,,,,,the two remaining (incorrect) studs on the front mounting plates holding the engine in place surrendered as quickly as a trollop during Fleet Week.
Off comes the head and NOW!! on to see what sort of pistons are in here!!....hoping they still are standards....no luck .......right off the bat they are not dished tops they are flat...ok so a piston replacement was previously done (God help me)...so we begin with the scraper on the thick layer of carbon....working at it like a gambler with a lottery scratch card the truth is finally revealed...left hand piston is only a .20 over...that's ok ...
not assuming anything or leaving it to chance I begin to check the right hand piston...wow Lucky Day!! this one is also a .20 over...however its markings are nothing like the left hand piston's so some DPO used pistons from either 2 different makers or at least different production batches...not surprised....
I am hoping that I can clean and hone this .20 over bore and possibly install 2 new (matching) 20's and rings...the carbon did not indicate a lot of running time on these nor did the ridge formation at the cylinder top...I would rather save the .30/.40 for a future owner if I can...once I get the cylinder off a gauged I will have my answer
So all-in-all not a bad dead-of-winter day's progress
Now for the question....The Oil Feed to the rockers draws directly via hose from the oil tank return(?) stem/pipe...is there any advantage to using the updated method of feeding from the Timing Cover?
Edited by - Gerard Harrison on 29 Jan 2011 8:15:06 PM
Cabin Fever has set in...I have run out of bits to polish, clean, repair or condemn in the warmth and comfort of the basement Man Cave.
It got into the upper 30's today so I waded through snow about 4 feet deep out to the garage to pluck off more bits of the bike to work on. Thinking to myself about the South American Rugby Team that plane-wrecked in the Andes and had the unfortunate displeasure of feasting on their comrades remains to survive...so off to the garage to pick at my mechanical carcass
Today's goal was to pull the head....the stretch goal was to get the motor out of the cradle. The head bolts and nuts were from a DPO's variety pack...three different spanners/sockets to address them...they all came out willingly much to my amazement once I determined the size. The rear underside head bolt was altogether missing so that was one chore spared. Clearly no one worried about details like applying the proper torque to any of the head assembly nuts and bolts...
The valves have some out sort of (I think) home made spring retainers...spun aluminum disks and the split keepers on two of the valves were of different dimensions on each valve.
Let me know if these strange spring retainers are some sort of special Dunstall or some-such "performance" bits...although given the state of the rest of the bike I doubt anything fancy was considered here....akin to giving a gold pocket watch to a derelict
So I grow weary rather quickly of trying to juggle the push rods up to get the head off and I move directly to my stretch goal.....pull the motor,,,,,the two remaining (incorrect) studs on the front mounting plates holding the engine in place surrendered as quickly as a trollop during Fleet Week.
Off comes the head and NOW!! on to see what sort of pistons are in here!!....hoping they still are standards....no luck .......right off the bat they are not dished tops they are flat...ok so a piston replacement was previously done (God help me)...so we begin with the scraper on the thick layer of carbon....working at it like a gambler with a lottery scratch card the truth is finally revealed...left hand piston is only a .20 over...that's ok ...
not assuming anything or leaving it to chance I begin to check the right hand piston...wow Lucky Day!! this one is also a .20 over...however its markings are nothing like the left hand piston's so some DPO used pistons from either 2 different makers or at least different production batches...not surprised....
I am hoping that I can clean and hone this .20 over bore and possibly install 2 new (matching) 20's and rings...the carbon did not indicate a lot of running time on these nor did the ridge formation at the cylinder top...I would rather save the .30/.40 for a future owner if I can...once I get the cylinder off a gauged I will have my answer
So all-in-all not a bad dead-of-winter day's progress
Now for the question....The Oil Feed to the rockers draws directly via hose from the oil tank return(?) stem/pipe...is there any advantage to using the updated method of feeding from the Timing Cover?
Edited by - Gerard Harrison on 29 Jan 2011 8:15:06 PM