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#266191 - 07/22/09 4:36 am B33 Tappet Clearance problem  
Joined: Dec 2002
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leon bee Offline
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leon bee  Offline
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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]  
Joined: May 2004
Posts: 3,411
BSA_WM20 Offline
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BSA_WM20  Offline
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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.


Bike Beesa
Trevor
#266231 - 07/22/09 1:51 pm Re: B33 Tappet Clearance problem [Re: BSA_WM20]  
Joined: Sep 2002
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Alex Offline
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Alex  Offline

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Seattle
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.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
#266237 - 07/22/09 2:48 pm Re: B33 Tappet Clearance problem [Re: Alex]  
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leon bee Offline
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leon bee  Offline
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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.

#266286 - 07/22/09 7:11 pm Re: B33 Tappet Clearance problem [Re: leon bee]  
Joined: Apr 2002
Posts: 962
beezageezauk Offline
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beezageezauk  Offline
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Posts: 962
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.

#266338 - 07/23/09 3:20 am Re: B33 Tappet Clearance problem [Re: beezageezauk]  
Joined: Dec 2002
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leon bee Offline
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leon bee  Offline
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arkansas
Okay, looks like I'm gonna have to take a grinder to something.

#266351 - 07/23/09 7:24 am Re: B33 Tappet Clearance problem [Re: Ray in Sunny CA]  
Joined: Oct 2002
Posts: 544
joe a. Offline
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joe a.  Offline
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Posts: 544
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

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

#266379 - 07/23/09 1:15 pm Re: B33 Tappet Clearance problem [Re: leon bee]  
Joined: Sep 2002
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Alex Offline
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Alex  Offline

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Seattle
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.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.

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