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#266191 - 07/22/09 4:36 am B33 Tappet Clearance problem
leon bee Offline
BritBike Forum member

Registered: 12/14/02
Posts: 2664
Loc: arkansas
I just can't get my .003, especially on the exhaust. Tried to follow the drill in the manual, but the adjusters just won't thread down far enough. Thats with engine cold, didn't think to check with engine warm. Engine running pretty well with bike on my bench, but maybe I better not do test ride till I figure this out.

Are these like an old Ford tractor, you take a file to something? Can you get the tappet/adjuster clear apart and do something to gain some room? Thanks for any ideas.

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#266206 - 07/22/09 9:12 am Re: B33 Tappet Clearance problem [Re: leon bee]
BSA_WM20 Offline
BritBike Forum member

Registered: 05/05/04
Posts: 2791
Loc: Sydney Australia
Usual suspect for a sudden change in the valve lash is the guides shifting.
Double if they have been replaced.
Next is incorrect length of valve.
Then is worn seat / baddly replaced seat .
Followed by worn out guides.

Now the number you quote seems a tad tight.
Without checking I think that you should be looking at .006" & .008" or there abouts.
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#266231 - 07/22/09 1:51 pm Re: B33 Tappet Clearance problem [Re: BSA_WM20]
Alex Online   content
BritBike Forum member

Registered: 09/05/02
Posts: 7342
Loc: NorCal
Leon, did you end up putting a gasket in the fire ring? The thickness of that gasket will change your clearances. You can make up for it by putting lash caps on the valves or lengthening your pushrods. The latter would be the correct thing for maintaining rocker geometry, but hell, it's a B33 slogger.
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#266237 - 07/22/09 2:48 pm Re: B33 Tappet Clearance problem [Re: Alex]
leon bee Offline
BritBike Forum member

Registered: 12/14/02
Posts: 2664
Loc: arkansas
Trevor: My book says .003. This is a long dormant engine I am getting going- history unknown.

Alex: For now, I just cleaned head joint and used some coppercoat. Seems to be holding okay. When cleaning the head, I found some mashed copper wire under the crud. So my problem is a little less clearance than I had before.....and that was barely .003 with adjusters all the way down. I guess I better pull the adjusters apart.

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#266286 - 07/22/09 7:11 pm Re: B33 Tappet Clearance problem [Re: leon bee]
beezageezauk Offline
BritBike Forum member

Registered: 04/23/02
Posts: 885
Loc: North East England
Leon, I've been running a B31 since 1974 and both the inlet and exhaust tappet clearances are set at .003 on a cold engine. B33's use the same settings so your book is correct.
Beezageezauk.

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#266338 - 07/23/09 3:20 am Re: B33 Tappet Clearance problem [Re: beezageezauk]
leon bee Offline
BritBike Forum member

Registered: 12/14/02
Posts: 2664
Loc: arkansas
Okay, looks like I'm gonna have to take a grinder to something.

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#266351 - 07/23/09 7:24 am Re: B33 Tappet Clearance problem [Re: Ray in Sunny CA]
joe a. Offline
BritBike Forum member

Registered: 10/14/02
Posts: 486
Loc: minnesota
leon....so you never said what the clearance is now.002 -.001?? the cyl grows and clearances increase so .002 would be ok....if you want to see check it when it is hot you should have clearance, just see if the tappet spins and make sure there are no tight spots as there may be a slight bend ...........the head/cyl are lapped in for correct sealing(and possibly some aluminum or coppercoat sealer used).maybe someone changed the sleeve, machined the flange, cases etc and the dims changed...joe@vcycle

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#266371 - 07/23/09 12:15 pm Re: B33 Tappet Clearance problem [Re: joe a.]
leon bee Offline
BritBike Forum member

Registered: 12/14/02
Posts: 2664
Loc: arkansas
Okay, I was kinda bluffing on the grinder. That tappet clearance is about the only thing keeping me from a test ride. Well..........that and the leaky 289 carb catching fire when she backfires.

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#266379 - 07/23/09 1:15 pm Re: B33 Tappet Clearance problem [Re: leon bee]
Alex Online   content
BritBike Forum member

Registered: 09/05/02
Posts: 7342
Loc: NorCal
289 carb leaky? Surely you jest!

Anyway, if you've got any clearance at all, take it for a spin...if not, you gotta fix it because you'll burn a valve. BTW, a copper head gasket or a cylinder base shim will cure it if you can't find another way.
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