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#423580 - 03/10/12 4:45 pm 650 timing cover Interchangeability?  
Joined: Jan 2007
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Atlanta Bonnie Offline
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Atlanta Bonnie  Offline
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Atlanta, Georgia
Is a 66-67 timing cover (part #70-4567) interchangeable with a 1968 timing cover (70-8797)? Iím running points in the 68 timing cover.

I have a good 66-67 timing cover and was thinking of swapping them, but there must be a reason for different part numbersÖjust not seeing it.

Thinking of swapping covers because the timing cover 3/8x26 CEI plug bolt (70-2615) that fits into the 1968 cover oil pressure switch hole is a loose fit..canít get it tight. Any suggestions on a fix to that? different bolt size etc...

Guessing a PO must have used a pressure gauge with different thread?


Bruce


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#423589 - 03/10/12 5:55 pm Re: 650 timing cover Interchangeability? [Re: Atlanta Bonnie]  
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DMadigan Offline
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DMadigan  Offline
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Not sure about the covers, possibly the alignment dowels?
The PO might have put in and 1/8 american pipe thread switch (0.3748" pitch diameter, 27 TPI).

#423617 - 03/10/12 9:55 pm Re: 650 timing cover Interchangeability? [Re: Atlanta Bonnie]  
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Jon W. Whitley Online content
Jon W. Whitley  Online Content



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The only thing I can see different is prior to 1968 the hollow metering dowel was used and maybe the '68 cover doesn't have that passageway ? All of the other parts appear to be the same.

I guess you are going to have to compare them side by side, concerning dowel location and or lack thereof on the '68. Then, if there is a hole on the '67 and it isn't needed maybe just plug it.


Jon W.


1957 6T Thunderbird 650
1971 TR6R Tiger 650
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#423631 - 03/11/12 12:03 am Re: 650 timing cover Interchangeability? [Re: Atlanta Bonnie]  
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Pete R - R.I.P. Offline
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Pete R - R.I.P.  Offline
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Vic. Australia
Originally Posted By: Atlanta Bonnie

Any suggestions on a fix to that? different bolt size etc...

If you just want to plug it up,a 1/8 NPT tapered plug would work.That would measure about 0.393" at the small end of the thread,and taper up about 0.010".Use teflon tape or Loctite 567 liquid teflon sealant.Be careful not to over tighten it,or you could crack the cover because of the taper.

The next step bigger would be to tap that out parallel to 1/8 NSP (0.404"),and fit the later pressure switch.You could do that without removing the cover;put grease on the tap,then pump some oil out afterward to clean it out.You might not easily find a parallel plug,but you could make one.

I can't notice any difference in the timing cases,and the early one probably fits.The metering dowel in the early crankcase doesn't change anything.That hole leads to the relief valve,and the later dowel is just plain,hollow.

#423642 - 03/11/12 1:21 am Re: 650 timing cover Interchangeability? [Re: Pete R - R.I.P.]  
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Atlanta Bonnie Offline
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Atlanta Bonnie  Offline
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Atlanta, Georgia
Thanks for the input guys. The 1/8 NPT tapered plug sounds like a secure fix, and I wonít have to remove the cover and reset timing.

Looking at a 1970 parts manual on-line, I see that part # 70-9526 is a tapered pipe thread plug to be used if the 60-2133 tapered oil switch is not installed. I believe that is what Pete is saying to use.

Doing a search on bb.com on oil switches emphasized the following: BE CARFUL TIGHTENING A TAPERED PLUG OR SWITCH, OR YOUíLL SPLIT THE COVER (per John Healey in a couple of threads & Pete today).

Iíll check to see if I can find one from one of our vendors. Doubt the local hardware store carries 1/8 NPT plugs?

Thanks


Bruce


#423646 - 03/11/12 1:41 am Re: 650 timing cover Interchangeability? [Re: Atlanta Bonnie]  
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Pete R - R.I.P. Offline
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Pete R - R.I.P.  Offline
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Posts: 3,549
Vic. Australia
Any place that sells plumbing fittings would most likely have a 1/8 NPT pipe plug.Look for a brass one,or an Allen-head plug.


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