Generator or alternator install fan and backing plates

[Zundfolge1432]

Today we will install backing plates and fan on a generator, it's same routine for an alternator. I'll go slow and load photos just three at a time tried more but they load out of order or not at all not sure why so here goes

[Zundfolge1432]

It's in the vise studs are at 12 and 6 position it's like you are sitting in the car looking backwards notice d+ and df are offset . Second photo show first backing plate it's recessed and that faces the generator. Third pic show the ring it acts as a stiffener

[Zundfolge1432]

Sorry the third pic is just the backing plate on the gen, it's forth pic showing the ring

[Zundfolge1432]

Five ring on the gen then the other half of the backing plate, notice it vents out bottom this cools the gen or alt

[Zundfolge1432]

[Zundfolge1432]

This series shows second backing plate, notice top stud at 12 next pic hardware 2 thick 2 wave and two M6 nuts. Next shows shows that's also how they go on next tighten , install woodruff key. Last pic shows that cooling opening points down

[Zundfolge1432]

[Zundfolge1432]

Install fan hub then the big wave washer mount the fan and you should have really looked close for stress cracks were the big wave washers contacts it, yes they crack and the break while you are driving last shows tightening with 36 mm socket

[Zundfolge1432]

[Zundfolge1432]

There's the socket you'll need and finally a torque stripe or witness mark has been applied to verify the fastener has been torqued and that it has not backed off. From now on we can peek back there with a mirror and know the nut is still torqued.

Two things I didn't show. 1. There is a spec measurement between fan and second backing plate, you increase this using shims between the hub and the fan. 2 there is a torque spec on the 36mm nut. Ck the Bentley you'll see it.

[runamoc]

[Zundfolge1432]

Thanks, we can call it done.

[kreemoweet]

[Zundfolge1432]

Ok it's not done thanks I've seen lots of chewed up and cracked fans where that washer seats, many moons ago I had one shell out while I was driving. Sounds bad, increases the pucker factor.

[Mangofish]

[Tim Donahoe]

Great information!

I did this once in 1994, but have now forgotten the method I used to hold the alternator stationary when tightening the nut. Can I assume that you stick the screwdriver in the slot to engage a bolt, as when replacing a fan belt?

Tim
_________________
Let's do the Time Warp again!

Richard O'Brien

[Mangofish]

To hold the alternator shaft while tightening the fan nut... I put an open-end wrench on the other end of the shaft where the fan belt pulley adapter and woodruff key is mounted. The adapter is square. The fan belt pulleys will go on later.

[Tim Donahoe]

Thanks for the information.

Tim
_________________
Let's do the Time Warp again!

Richard O'Brien

[Glenn]

Thanks Jim.

I'll add it to the FAQs when I get a chance.
_________________
Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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[Zundfolge1432]

As they say "size matters"