centre is threaded and threads stop where the pulley seats onto pulley boss. I have tried to make it as close to the centre as possible but it still wobbles vertically.
Arghh
[Edited on 23/9/15 by AndyGT]
Just fitted a new water pump only to realise a small error
Original pump pulley/fan retaining bolts - 5/16 UNC
New pump M8
No big issue except I can't get the pulley to run centre as the original bolt holes are bigger....
I suppose I could drill out and re-tap but not easy to find 5/8 taps...
Any suggestions appreciated
The pulley normally centres on the boss in the middle. The bolts just stop it falling off.
nope.
centre is threaded and threads stop where the pulley seats onto pulley boss. I have tried to make it as close to the centre as possible but it still
wobbles vertically.
Arghh
[Edited on 23/9/15 by AndyGT]
why not get the correct part instead?
Centre it, drill through to pump and use split pin/dowl
I'm with Brian on this one.
The difference between 5/16" and 8mm is 0.062mm or 2 and a half thou. I doubt this is the issue.
I had to make a water pump pulley on my 907 engine and like Brian says, they centre on the hole in the middle,
much like a road wheel does. I found a pulley with the correct offset and welded up the centre hole then machined
a new hole on the lathe.
Paul G
Edit to add:-
p.s. If it's a cup shaped steel pressing type then these can get knocked out of true.
p.p.s. I take it that the ref to the 5/8 tap is a typo.
[Edited on 24/9/15 by 907]
quote:
Originally posted by AndyGT
nope.
centre is threaded and threads stop where the pulley seats onto pulley boss. I have tried to make it as close to the centre as possible but it still wobbles vertically.
The water pump for the Valencia engine was very similar to Xflo but not quite identical.
"Don't quite understand what you mean, but the water pump pulley on my old Xflow definitely centred itself on the boss in the middle of the
flange. The holes are always drilled with some clearance so centring will never be perfect if you only rely on the bolts. Same as using wheels on a
car that don't have the correct size centre bore for the hub - vibration is very likely. "
All my xflows, and yes I mean ALL are exactly the same as the above post
"The water pump for the Valencia engine was very similar to Xflo but not quite identical."
and being a modern engine will probably be metric threads and the crossflow pulley may not fit ?
[Edited on 24/9/15 by steve m]
quote:
Originally posted by britishtrident
The water pump for the Valencia engine was very similar to Xflo but not quite identical.
quote:
Originally posted by AndyGT
nope.
centre is threaded and threads stop where the pulley seats onto pulley boss. I have tried to make it as close to the centre as possible but it still wobbles vertically.
Arghh
[Edited on 23/9/15 by AndyGT]
quote:
Originally posted by rusty nuts
Do you mean the centre has a male thread ? If so it sounds like the pump is for use with a viscous fan although I can't remember a X flow using one unless it was an old Transit? A correct new pump isn't going to cost the earth
"xflow woes
Just fitted a new water pump only to realise a small error
Original pump pulley/fan retaining bolts - 5/16 UNC
New pump M8
No big issue except I can't get the pulley to run centre as the original bolt holes are bigger....
I suppose I could drill out and re-tap but not easy to find 5/8 taps...
Any suggestions appreciated "
Why not find out were the center line is on the holes in the pulley and drill four new ones in the right size and place
I did put the figures in my previous post but I'll try another tack.
The difference between 5/16" and 8mm is the equivalent of a single normal human hair.
Paul G