AndyGT
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| posted on 23/9/15 at 10:24 PM |
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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
nothing is impossible
everything is possible
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Brian R
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| posted on 23/9/15 at 10:33 PM |
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The pulley normally centres on the boss in the middle. The bolts just stop it falling off.
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AndyGT
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| posted on 23/9/15 at 10:40 PM |
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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]
nothing is impossible
everything is possible
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ste
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| posted on 24/9/15 at 04:46 AM |
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why not get the correct part instead?
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snapper
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| posted on 24/9/15 at 06:10 AM |
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Centre it, drill through to pump and use split pin/dowl
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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907
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| posted on 24/9/15 at 07:07 AM |
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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]
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MikeRJ
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| posted on 24/9/15 at 09:51 AM |
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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.
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.
A picture of your pump and pulley would help.
[Edited on 24/9/15 by MikeRJ]
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britishtrident
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| posted on 24/9/15 at 11:14 AM |
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The water pump for the Valencia engine was very similar to Xflo but not quite identical.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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steve m
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| posted on 24/9/15 at 03:42 PM |
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"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]
Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at
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Paul Turner
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| posted on 25/9/15 at 07:25 AM |
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quote:
Originally posted by britishtrident
The water pump for the Valencia engine was very similar to Xflo but not quite identical.
To me that makes sense and since its a later continental version of the X-Flow it would seem logical the threads would be metric.
Would suggest you need to get a pump for a real crossflow.
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rusty nuts
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| posted on 25/9/15 at 08:30 AM |
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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]
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
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Paul Turner
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| posted on 25/9/15 at 10:41 AM |
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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
My 1980 Mk 2 1600 Escort had a viscous fan as did all Mk 2 Escorts after about April 1979 and at that age it would 100% have been imperial bolts.
According to Mr Haynes it fits onto the pump in exactly the same way as the standard fan i.e. the bolts secure the fan assembly and pulley by passing
through both components into the pump. There is no mention of it screwing on or needing a different pump.
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steve m
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| posted on 25/9/15 at 04:54 PM |
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"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
Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at
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907
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| posted on 25/9/15 at 05:35 PM |
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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
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