Fan belt alignment

[Coatescooper]

Hello,

Onto my next task, sorting the alignment of my fan belt.

The alignment is being thrown out by the dynamo pulley being to far out/offset from the Dynamo.

There appears to be a spacer circa 8mm thick pushing the dynamo fan out that little bit to far, I have taken it off but then some of the fan blades are catching on the Dynamo slightly.

Any ideas?

Some pictures attached

[Coatescooper]

Additional picture

[GraemeC]

Are the water pump pulley and the crank pulley in line?

[Coatescooper]

Yes, water pump and crank pulley both seam fine. It’s just the Dynamo that is out of line

[Peter Laidler]

I haven't got your car - or problem - in front of me but it sounds like a VERY small amount of clearance is required. I'd space the generator fan blades FORWARD sufficient to clear and machine the in-built spacer at the rear of the pulley back by the same amount. Or machine the fan blade back to clear.

[Andrew1967]

The built in spacer on the pulley looks like it could be wider the the standard pressed pulley spacer which will push the pulley out of line.

Could be wrong ?

Just took a pic of my set up .. may help

[Coatescooper]

Thanks Andrew1967. Your picture is very helpful. Looks like my fan is circa 5mm further out than yours which explains it.

I guess I need a different spacer? Or am I okay with running without a spacer? As long as the fan blades are not rubbing on the Dynamo

Also is the diameter of the pulley okay? As it’s only 70mm

[Daz1968]

I would think having the spacer machined down to align pulley would be easiest option.

[Coatescooper]

I’ve been out and done some more measurements, the spacer is kicking the fan out by about 6mm, it’s only about 8mm thick!

[Andrew1967]

I think I have a dynamo with the pulley off .. I’ll go check.

[Daz1968]

I am pretty sure my spacer only just sat proud of the Dynamo, but been a while since I had it apart,

[Andrew1967]

Is that spacer fully home in the 2nd pic posted at 9.02 ?

I've got this dynamo and there's only a small amount sticking out to give the pulley clearance.

[Polarsilver]

If all checks out ok with the Dynamo spacer .. another solution is to reduce the width of the Water Pump casting in the area of the Dynamo bolt .. that will allow some alignment to be changed .. also while your at it just check the water pump body when bolted up in position does not foul the underside of cylinder head .. ok this will not effect pulley alignment but still worth checking that there is cyl; head to water pump clearance.

[360gts]

I think you have the incorrect dynamo pulley. That is a solid steel item....they were used on alternators etc. and on other cars.
You need a pressed steel pulley......like this one. Also showing a solid steel pulley like yours...you can see there is a much bigger shoulder on these.

[Coatescooper]

Is that spacer fully home in the 2nd pic posted at 9.02 ?

I've got this dynamo and there's only a small amount sticking out to give the pulley clearance.

Yes, it is fully home, I think the spacer is the issue, comparing your measurements with mine the distance from the fan to the centre of the pulley is the same, so I don’t think it is a pulley issue, but the distance from the Dynamo to the fan is circa 5mm greater on mine, I think this is caused by the spacer protruding by 6mm as opposed to the one you have shown which is about 1mm ish.

Question is how do I go about getting a smaller spacer?

[Andrew1967]

Just measured the spacer and it’s about 7mm so I wonder if the problem is something behind the spacer ??

[Coatescooper]

Just measured the spacer and it’s about 7mm so I wonder if the problem is something behind the spacer ??

It’s solid behind the spacer, I have double checked the Dynamo at it says it is the correct one, but I’m wondering if this is the case

[Andrew1967]

Heres a pic of my dynamo showing how most of the spacer fits inside the front housing.

[Coatescooper]

Heres a pic of my dynamo showing how most of the spacer fits inside the front housing.

Thanks, this is much appreciated. I will look at mine a lot closer when I’m home tomorrow

[Peter Laidler]

Been following this saga on and off and it's clear that you have a mix-and-match dynamo/fan/pulley fitted to your car. However good your pics and try as we might I don't think that we are going to fix your prob from afar. It needs either a) replacement parts, b) a replacement correct dynamo or c) a lathe to start machining your parts to suit - or in the case of the spacers, to machine new ones to suit what you've got (which would be my tight fisted but hands-on approach!!)