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Dommy rocker spindles wear.

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Dommy rocker spindles wear.

Posted by robert_tuck at September 03. 2017

One of my inlet spindles is loose in the head and is set further in so does not engage well with the plate. What is the normal fix for wear in the head bore?.

Re: Dommy rocker spindles wear.

Posted by anna jeannette Dixon at September 03. 2017

Hello Robert   Well this is the first sign of poor oil feed to your cylinder head rocker feed   the right option you now have is to remove the cylinder and replace it with another  or have the all the spindle holes milled out to have an interference fit  for bronze bushing, with oil hole in it and then fit with new thackery washers   and get the oil ways blown through including the drain hole on the inlet side next to the valve springs  has shown on my photo  below  I do hope this fixes your problem    have a nice time we wish you well  so good luck yours   anna j 

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Re: Dommy rocker spindles wear.

Posted by david_evans at September 03. 2017

How loose is it Robert? If it is just loose enough to slide inwards and no more loose than that, you could consider a careful application of loctite with a small spacer inboard of the spindle to prevent the spindle disengaging from the end plate. If it is really floating around then boring and sleeving may be a solution.

If as Anna says the oil feed has been poor, the rocker may have seized on the spindle then the spindle will have been rotating in the head.

If a spindle say 0.002" larger in diameter will hold position then chrome plating would be another solution. I would think that your rocker would be worn large enough to deal with a spindle a couple of thou bigger

Re: Dommy rocker spindles wear.

Posted by robert_tuck at September 03. 2017

Yes David thats the way I was thinking, there is at least 2 thou wear in the outer bore  ,dont know if the inner is as bad ,if not then may do a real bodge with a strip of feeler plus locktite ,and a washer in the inner bore to get the side plate to engage.  Could copper plate the ends of the spindle as its not supposed to rotate.

Re: Dommy rocker spindles wear.

Posted by david_evans at September 03. 2017

I think the loctite should be good enough to deal with a few thou. the feeler gauge is a bodge too far in my opinion.

Re: Dommy rocker spindles wear.

Posted by ian_cordes at September 04. 2017

I have used the RGM modified plates, as I found that a couple of the locating tabs on the standard plates had broken off, allowing the spindles to turn. A good, if slightly pricey, solution, which should take up the end play on your spindle, provided it is not already worn.

Re: Dommy rocker spindles wear.

Posted by david_evans at September 04. 2017

Radial play is what you really need to deal with here and I suppose the RGM solution will do that. Worth a try with loctite first as it's easily accessible and cheap

Re: Dommy rocker spindles wear.

Posted by john_holmes at September 04. 2017

Never had much luck with locitite on a steel part in aluminium, the bond does not last long, guessing the different expansion rates with heat break the bond after a few heat cycles. Copper plating is a lot cheaper that hard chroming and is used to recover worn bearing housings but plating the OD of the bearing, and the RGM locking plates sound good too.

Re: Dommy rocker spindles wear.

Posted by anna jeannette Dixon at September 04. 2017

Hello these Spindel locators are not going to help worn rocker spindle holes may guesstimate is the others are getting worn to it's not going to be cheap the do the right good job or find another good cylinder head  So cheap fixes are Not the answer here  Bit the bullet get a good long lasting job done!    Yours   Anna J

Re: Dommy rocker spindles wear.

Posted by robert_tuck at September 05. 2017

You are right Anna,no decision will be made till I know the extent of the problem.  Luckily I have a good engineer who will do a proper job if thats needed. He is so good that whatever the problem is no disscusion is ever needed , I just give him the parts and pay later!. The RGM fix sounds a bit heath robinson but is not that exspensive, anyone tried it?.

Re: Dommy rocker spindles wear.

Posted by ian_cordes at September 05. 2017

Robert. If you read back through the posts here you will see that I have fitted the RGM kit to my 650SS motor. It is not at all Heath Robinson, and positively prevents the spindles from turning. However it is not a cure for wear in the head, if that is what the problem is. Personally, I would try a new spindle first; you never know....

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