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#827071 10/19/20 4:43 am
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Bob E Offline OP
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what kind of job is it to install the tach drive in the rh side engine case? the more I get into this engine the less confidence I have in the job the guy did putting it together. finding a lot of things screwed up on the outside, hope internals are correct. anyway, I want to install the tach drive, do I have to take the case apart?

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Providing you still have the two tangs on the oil pump, the drive just pushes in from the outside point and the 2x screws to hold the case down. Screw on. The tach cable and your away.

Always remember to remove the tach drive when going to remove the inner timing cover as this is how the oil pump tangs get broken.


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Thanks Allen. looks like I still have the 2 tangs still on the pump. have to order the parts and install it now, but, the cover that held on the plate where the drive should of went only had 1 bolt holding the cover on. the other hole had the snapped off bolt in it, and the builder left it in there and just put cover on with 1 bolt. now I have to try and get broken bolt out with ez out or something

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Tach drive bolts are 2BA, first try, use a small centre punch , make a small dimple near the perimeter, then try to drive the screw round to unscrew, this works most of the time. next try, if that fails , punch the dead centre and drill through with an 1/8 th drill, left hand drill if you can get one, then take a small torx bit and drive it into the hole, then unscrew.

As well as the spindle there are other sealing details, an O ring for the drive spindle, gasket , tab washer, and where the tach drive cable screws on another O ring to seal the cable. the cable should have a flat wire reinforcement and heat shroud at the lower end.


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Bob E Offline OP
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Thanks Gavin, I'm going to try the center punch method when I get home tonight.

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Success, tried putting a dimple in perimeter, no luck. was able to drill the center and tap the smallest size ez out I had, a #3 into center and the broken part of bolt finally let go and came out, even saved the threads.

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GOOD WORK!

Patience brings rewards.

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Result,stay tach less , unless you regularly go past 60 in 2nd. its extra weight.


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Gavin, I bought a new speedo and tach for this project a few years ago, and I want to use it, mostly to bring it back to stock configuration. what really pissed me off was the engine builder for my engine would give me back the engine with that tach bolt broke off, 1 bolt holding the cover on. I really did not pay much attention till I took cover off and seen it. this has been an ongoing project, off and on for about 5 years and im just starting to get back into it and a lot of work to go.

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Originally Posted by gavin eisler
Result,stay tach less , unless you regularly go past 60 in 2nd. its extra weight.


I need the tacho then...................

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Bob E Offline OP
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so I got the parts for the tach drive install. question I have is there is a tube that slides over the tach drive shaft. does this tube secure the tach drive to the tangs on the oil pump? kind of just slide over the tangs and keep the 2 pieces together? thanks

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Bob E Offline OP
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?

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Yes, the drive is two pieces, although it's not usually not obvious because the two pieces are usually stuck together. Until recently, I always thought it was one piece.

Right, the tube does not secure the drive to the oil pump, it just keeps everything in line, controls radial thrust on the drive.


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Thanks Mark. yea, it is 2 pieces, the tube slides right off the drive. going to have to grease it up good to keep the 2 parts together when I go to lower it down into the pump tabs

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I wouldn’t worry about grease, oil fill find its way around everything and even up the cable.


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68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)


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