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I'm working on getting my '65 Thunderbolt Rocket on the road and want to drain and fill the primary. In the manual it says locate the red screws on the bottom of the primary but the red is long gone I'm afraid. Can someone tell me which ones are which?

Another question? I tried filling the primary with ATF with what I thought was the level screw removed....when I started draining the gearbox I was getting ATF draining out?


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BSA brilliantly used one of the cover bolts as the level screw and another for the drain. I think it is the one vertically aligned with the rear edge of the crank timing inspection plate. Early engines did ont have the inspection plate either so imagine a line about 3" aft of the crank. The screw should have a fibre washer to keep most of the primary oil in. Best to measure the oil in a cup and pour it in.
Sounds as though you pulled the gearbox drain, toward the middle of the engine. The gearbox and primary are not connected oil wise. Did you put ATF in the gearbox? The gearbox filler is on the right side top near the inner case joint.

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Hi,
The pic below is a '68 but I think yours is the same. The red screw on the left is level and the one on the right is drain. I use F type ATF for some forgotten reason.

[Linked Image]

Cheers~Bob


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Thank, the pic helped. I kind of thought it was those two for some reason. I did find on small dot of red paint on what you showed as the level screw.



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Originally Posted by DMadigan
BSA brilliantly used one of the cover bolts as the level screw and another for the drain. I think it is the one vertically aligned with the rear edge of the crank timing inspection plate. Early engines did ont have the inspection plate either so imagine a line about 3" aft of the crank. The screw should have a fibre washer to keep most of the primary oil in. Best to measure the oil in a cup and pour it in.
Sounds as though you pulled the gearbox drain, toward the middle of the engine. The gearbox and primary are not connected oil wise. Did you put ATF in the gearbox? The gearbox filler is on the right side top near the inner case joint.


I was draining the gearbox at the same time. Maybe some PO put ATF in there? Also when I drained the primary I got at least a quart of oil out.
What is the correct amount? I imagine it can't be much....


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The primary drive should have quarter of a pint of SAE 20 oil.
Having said that, if you remove the level plug, you should get it right anyway.

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Originally Posted by Henry Greg
The primary drive should have quarter of a pint of SAE 20 oil.
Having said that, if you remove the level plug, you should get it right anyway.


Thanks. I took a guess at 5oz. I just took it up the road a few miles and back. It sounds like I have a litlle bit of spark knock under hard acceleration, but the excess oil leaks are gone.


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