1967 P11 rebuild - Dynamite on wheels

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1967 P11 rebuild - Dynamite on wheels

Postby g80csp11 » Wed Aug 12, 2020 6:46 pm

Started the 'limited' rebuild of my 1967 P11 today while i've got time at home
Its been burning oil for a while , certainly more than it normally does
Kitchen clear to give space , and head off with engine still in the frame , barrel off later ready for removing engine from the frame

Makes a change to do this at home and not on the way to a rally or a few days before leaving with a deadline looming
Its always been my long distance touring bike , and I dont think the G15CSR will replace it due to 2.5gall fuel tank but time will tell

also forces me to clean the bike while doing the rebuild . first impressions are that there is not ridge in barrel so may be just a new set of rings and hone (wishfull thinking at this stage)
Plan is to replace superblend main bearings and BE shells at the same time

cylinder head off.jpg
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Last edited by g80csp11 on Sun Aug 16, 2020 8:39 am, edited 1 time in total.

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Re: 1967 P11 rebuild

Postby G15 Roy » Thu Aug 13, 2020 5:37 pm

Nice to see the kitchen back in use
Roy

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Re: 1967 P11 rebuild

Postby g80csp11 » Thu Aug 13, 2020 5:41 pm

Slide1.JPG
Slide2.JPG


Pistons in good condition although oil burning confirms oil consumption and blow-by past rings
heavy crusty deposits on crown
Cylinder bores in good condition with circ 1 -2 microns wear at maximum
Pistons are +.040 modern hepolite manufactured by JCC and sold under Genuine Hepolite brand by wassell

decided to de-glaze bores and fit new rings

rings are fully bedded in with top and second ring still with 15 thou ring gap , but the oil control ring is at circ 50 thou
must e very soft cast iron giving fast bed in , but reduced durability

overall , no significant problems that cant be easily overcome
not bad considering the distance and performance
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Re: 1967 P11 rebuild

Postby g80csp11 » Thu Aug 13, 2020 5:43 pm

Roy , it was either this or cut the hedges and i know which i prefer to do

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Re: 1967 P11 rebuild

Postby bitza » Thu Aug 13, 2020 5:47 pm

Save time in and out the house making tea and sarnies, forward planning I think that's called.

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Re: 1967 P11 rebuild

Postby raffles » Thu Aug 13, 2020 5:49 pm

The kitchen is the wright place for an old cooking norton
good luck with the rebuild
Tony

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Re: 1967 P11 rebuild

Postby g80csp11 » Sun Aug 16, 2020 8:01 am

dynamite on wheels.jpg


check this utube clip out , is this why that called the P11 dynamite on wheels
I suspect this was a rod failure , after which the broken rod gets trapped between the crankcase and flywheel

https://www.youtube.com/watch?v=CugNxr9aXC8


Mine has had rod failure in the past , with extensive repairs ( pictures later ) , luckily no where near as bad as this one
I can only imagine what he was saying at this point !

SO anyone rebuilding a G15 or P11 should check their conrods during rebuild and fit the later 'superblend' main bearings
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Re: 1967 P11 rebuild - Dynamite on wheels

Postby ajscomboman » Sun Aug 16, 2020 8:49 am

g80csp11 wrote:
dynamite on wheels.jpg


check this utube clip out , is this why that called the P11 dynamite on wheels
I suspect this was a rod failure , after which the broken rod gets trapped between the crankcase and flywheel

https://www.youtube.com/watch?v=CugNxr9aXC8


Mine has had rod failure in the past , with extensive repairs ( pictures later ) , luckily no where near as bad as this one
I can only imagine what he was saying at this point !

SO anyone rebuilding a G15 or P11 should check their conrods during rebuild and fit the later 'superblend' main bearings


Thanks Peter, you really put my mind at rest now!!! :headbang: :headbang: :rofl:

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Re: 1967 P11 rebuild - Dynamite on wheels

Postby g80csp11 » Sun Aug 16, 2020 9:02 am

Rob , you wait until you see the welding on my crankcase - haha
I'd just sell it at a loss ASAP , I might even make you a low offer

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Re: 1967 P11 rebuild - Dynamite on wheels

Postby Stan Palmer » Sun Aug 16, 2020 9:28 am

Looks as though the gear lever would straighten out ok.

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