Water pump clearance?

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tony g
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Water pump clearance?

#1 Post by tony g »

What is the bolt to cover clearance on a Sprint please?. Book says 010" to 025" (0.25 to 0.5mm) but I believe some run a bigger clearance than this. Be nice to make this an easy search. I tried searching and theres a few threads with Jonners' how to rebuild etc but no figure on the clearance. :)

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Tony
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Mad Mart
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Re: Water pump clearance?

#2 Post by Mad Mart »

I've always done them +0.010" Tony.
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Magenta Auto Sprint
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Re: Water pump clearance?

#3 Post by Magenta Auto Sprint »

I didn't bother with the feeler gauge method of shimming the water pump,

I used a length of lead wire, sat it on top of the LH bolt, tightened down the housing, removed and used a micrometer to measure the thickness of the lead wire.

I should also state that I did clean the head of the LH bolt first to ensure it was flat.

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tony g
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Re: Water pump clearance?

#4 Post by tony g »

010" thou is the book minimum So I may go a tad bigger than that. Ive measured both sides with a depth gauge and can calc from that. Think I'll aim for 020".

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mahony
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Re: Water pump clearance?

#5 Post by mahony »

I always got away with using the thickest gasket that came with the repair kit 8)
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Flyfisherman
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Re: Water pump clearance?

#6 Post by Flyfisherman »

Tony

Have a read of this:viewtopic.php?f=4&t=7214#p67964

Paul
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soe8m
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Re: Water pump clearance?

#7 Post by soe8m »

mahony wrote: ↑Mon Dec 04, 2017 7:04 pm I always got away with using the thickest gasket that came with the repair kit 8)
Me too.

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tony g
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Re: Water pump clearance?

#8 Post by tony g »

Thats what I went with in the end. :)

Tony
soe8m wrote: ↑Mon Dec 04, 2017 10:28 pm
mahony wrote: ↑Mon Dec 04, 2017 7:04 pm I always got away with using the thickest gasket that came with the repair kit 8)
Me too.

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tony g
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Re: Water pump clearance?

#9 Post by tony g »

Cheers Paul, but that thread doesnt give a dimension, at least no that Ive seen speed reading it. I know all the mechanics of how to rebuild but was after the "increased" clearance. Ive now built it with 20 thou clearance so I'll see how it goes (I have major mods going on that may well cause more problems lol.

Cheers

Tony
Flyfisherman wrote: ↑Mon Dec 04, 2017 10:26 pm Tony

Have a read of this:viewtopic.php?f=4&t=7214#p67964

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Re: Water pump clearance?

#10 Post by Flyfisherman »

tony g wrote: ↑Mon Dec 04, 2017 11:21 pm Cheers Paul, but that thread doesnt give a dimension, at least no that Ive seen speed reading it. I know all the mechanics of how to rebuild but was after the "increased" clearance. Ive now built it with 20 thou clearance so I'll see how it goes (I have major mods going on that may well cause more problems lol.

Cheers

Tony
Flyfisherman wrote: ↑Mon Dec 04, 2017 10:26 pm Tony

Have a read of this:viewtopic.php?f=4&t=7214#p67964

Paul
Tony

yes no sizes mentioned - but it states the old school way of checking bolt to cover clearence "Feeler gauges" like the manual states.

Paul
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Re: Water pump clearance?

#11 Post by MIG Wielder »

Magenta Auto Sprint wrote: ↑Mon Dec 04, 2017 9:14 am I used a length of lead wire, sat it on top of the LH bolt, tightened down the housing, removed and used a micrometer to measure the thickness of the lead wire.
I should also state that I did clean the head of the LH bolt first to ensure it was flat.

Malcolm
Now I really like that idea. I imagine you used a length of thick solder wire.
Since I reckon the actual important dimension is the water-pump vane to cover clearance, I wonder if the idea could be extended to creating a flat spiral of lead wire to overlay the pump vanes, tighten down the cover and measure the actual clearance between the cover and the vanes ?
And see how this compares with the bolt-to-cover dimension perhaps ?

Tony.
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