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Does it matter that the pin in the middle of the water pump doesn't go throughout the center of the fan?

Hey Trev ......will it matter if the fan goes thru ya bonnet .....just messin wit ya mate ...but theres a lot of centrifical force on the fan and I,ll be thinking best get a fan that fits .....theres also the balance question ....gotta get it right otherwise it will vibrate it self to pieces and thru the bonnet again.....All the best Fingers

Trev,
I have never known an OEM fan which doesn't centre around the pin in the water pump rotor face (actually end of water pump shaft).
As mentioned above, even the most slight off-centre fitted fan will cause great forces which will impact on not only vibration on the engine, but will prematurely wear the bearings/seals in the water pump. I expect that your fitting is such that the fan pully fits centred over the pin... is it that your fan centre doesn't reach the pin when bolted up tight? - or perhaps the fan is compressed against the pin as you bolt it up?
I would be very concerned with the latter - compressing the fan mount face would most likely deflect the blades towards the generator and/or harmonic balancer. If prolonged use created a "set" on the assembly - it could very well strike either of these and a great calamity would almost ensure you ripped your radiator to bits..... not to mention the potential damage around the engine bay (good way to effect "slats" in your bonnet).....

As you would probably be aware, the harmonic balancer belt pulley diameter is greater than the fan pulley - this results in a fan which spins faster than the engine..... if you are at the highway limit with a 3:89 diff - there is potential for the fan to be spinning at very much more than 4,000 rpm - possibly more ( I don't know the ratio between harmonic balancer and fan pulleys)..

frats,
Rosco

I started it today, then realised that I didn't have my radiator in the car so I was squirting tranny fluid everywhere .
But I didn't feel any vibrations.
The water pump would only have done a couple of hundred km .

Trev can I ask why you cant use the locating pin on the water pump and the pulley is also on the same locater is this going to be used as well ......all fan to pump systems I can think about run locating pins and no doubt when they were developed by the manufacturer they did a lot of research and development and spent a power of money on engineering ensuring they did the right thing ...even if it doesnt show any signs of vibration under low revs it could under high revs and constant loads you just have to ask yourself is it worth taking the chance and why did the manufacturer make it that way to begin with .... ..its a little like thermostats some folks chuck it but they dont think of the possible long term damage the motor running at colder temperatures in the first 2 cyclinders causes premature and excessive wear rates .....this again the engineers spent many hours and much dollars developing so we can say f$#k it it dont need a thermostat these engineers guys didnt know jack shit about cooling systems ...you know how it goes mate ..........Fingers

fingers wrote:Trev can I ask why you cant use the locating pin on the water pump and the pulley is also on the same locater is this going to be used as well

I am trying to but the locating pin but it's too short.

fingers wrote:even if it doesnt show any signs of vibration under low revs it could under high revs and constant loads you just have to ask yourself is it worth taking the chance and why did the manufacturer make it that way to begin with

Means I am spewing I have to replace it

fingers wrote:you know how it goes mate ..........Fingers

Yeh, I was hoping someone would say "it really doesn't matter" .

Trev ...2 things you can do .. providing your using a boss of course ( i dont mean ya misses either )......machine the alum. boss back a litlle or I will have a red motor boss in my shed if ya want ...from memory the early reds had the fan mounted directly to the water pump flange..in which case a change over water pump for Trev ..Keep us informed mate ...Fingers

I have had to get rid of the boss to get the fan in behind the radiator, thanks for the offer mate .

Ok, I have both water pumps off, one shaft is 8mm and the other is 17mm

Guess you've resolved the issue....
I'm not certain - it was a very long time ago.... but I believe the EH fan was set further back towards the engine - I have one on mine, pic if you need it.
I can just barely slip my fingers between my fan bolts and the radiator - it is about the same at the rear of the engine. It depends on where the cross-member engine mounts were welded - Rares did mine on a jig when they were at Brunswick. Up to EK had the mounts located the furthest back, EJ/H just a tad forward.

frats,
Rosco

Picked up my new radiator today, will be fitting it all back together tomorrow.
My fan is very close to the radiator also Ross, my only prob was putting a different fan on which flexed too far forward .

All good, Trev - keep a close check on your engine mounts ..... I watch mine like a hawk.... even without the fan fitted, those bolts run pretty darned close to the radiator - I wonder how close they get when the rear axle goes over bad corrugations under power...?

frats,
Rosco