67 BB alternator question

[Lorne G.]

The alternator on my 67 Big Block with P/S does not have a lock washer behind the assembly nut, is this correct? I thought all alternators used a lock washer.
Also there is a flat washer spacer between the pulley and alternator fan blade. Is this correct as well?

I am not familiar with Big Blocks with power steering.

Thank you.
Lorne

[Leif A.]

Re: 67 BB alternator question

In the '67 AIM, UPC L36, A3 shows a lock washer installed.

[Lorne G.]

Re: 67 BB alternator question

Sorry, perhaps I was not clear about which lock washer. I meant the the lock washer behind the nut holding the pulley on the alternator shaft. My alternator does not have a lock washer behind the pulley nut.
I also have a flat washer between the pulley and the fan blade which I don't is correct.

The previous owner changed the pulley and I think he assembled the pulley incorrectly.

Lorne

[Joe L.]

Re: 67 BB alternator question

Sorry, perhaps I was not clear about which lock washer. I meant the the lock washer behind the nut holding the pulley on the alternator shaft. My alternator does not have a lock washer behind the pulley nut.
I also have a flat washer between the pulley and the fan blade which I don't is correct.

The previous owner changed the pulley and I think he assembled the pulley incorrectly.

Lorne

Lorne------

No washer between the fan blade and pulley. The pulley is retained to the shaft by a "wave" washer, GM #1941978, and a special nut, GM #1915172. The washer is discontinued. The nut remains available.

When the assembly is mounted and the nut torqued, the washer appears as a flat washer since it is compressed.

By the way, a washer between the pulley and the fan might be necessary if an incorrect pulley is being used.

[Lorne G.]

Re: 67 BB alternator question

Thanks Joe,

That is the information I needed. I will check with some of the Corvette aftermarket retailers to see if I can find a wave washer since GM no longer carries them.

Lorne

[Joseph A.]

Re: 67 BB alternator question

I believe there should be a lock washer behind the nut, I have a 427/400 with P/S and there is a lock washer.

[Joe L.]

Re: 67 BB alternator question

I believe there should be a lock washer behind the nut, I have a 427/400 with P/S and there is a lock washer.

Joseph------


There is a lock washer behind the nut. It's the "wave" washer I described above. The "wave" produces a "spring-like" locking action.

If you're referring to a split lockwasher, I do not believe they were originally used. However, they are the type usually supplied with rebuilt alternators (or, field installed by folks that lost the original washer).

[Gary B.]

Re: 67 BB alternator question

Lorne,

NOS GM 1941978 wave washers show up on eBay. Search for them there. Not cheap, but the real deal.

Gary

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