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- #81
The vacuum pump is a vane-type pump which requires oil both to lubricate the vanes and, I believe, to seal the vanes against the housing. It's the same principle as the power steering pump.
The fault-finding is aimed more at defective alternators so if yours works fine (i.e. putting out about 13.8 V) it's not really necessary. The brushes are the only thing which regularly wear out.
The vacuum pump should be spotlessly clean when you put it back together though, and I would also replace the copper washers on the banjo fitting if you disturbed them.
I think that's a pretty rare alternator with a vacuum pump and an internal voltage regulator, so take care of it
Good to know! Ill make sure to be a good steward of this piece of Toyota history!
Couldn't really clean in the vacuum pump as it was behind that block off plate, but I made sure no debris got in. Time will tell how I did.