Volvo Penta CAV filter thread size

[lustyd]

Does anyone happen to know what the thread is on the air bleed screw of a cav filter for VP MD2040?
Internet suggested M10x1 but it’s not that.

Trying to buy a suitably sized hose barb to connect to it properly rather than bodging a bit of tube into it.
Thanks

 

[PaulRainbow]

Pardon our interruption...

Says 10mm x 1.5

 

[lustyd]

Thanks Paul, unfortunately I’ve seen various quoted including 3/8 in various forms. Was hoping someone would know for sure without me having to buy a bunch of things

 

[Malish]

Thanks Paul, unfortunately I’ve seen various quoted including 3/8 in various forms. Was hoping someone would know for sure without me having to buy a bunch of things

can't give you a definitive answer but I would hope this chap can: SSL diesel Parts - Supplier Of Low Cost diesel fuel Parts

 

[penberth3]

Thanks Paul, unfortunately I’ve seen various quoted including 3/8 in various forms. Was hoping someone would know for sure without me having to buy a bunch of things

The only way to be sure is to measure what you've got.

 

[PCUK]

I seem to remember they had a UNF thread but a bsp thread was near enough and could be eased in and would seal properly.

 

[lustyd]

I seem to remember they had a UNF thread but a bsp thread was near enough and could be eased in and would seal properly.

Yes it looks like a UNF 3/4 and M10 are very close. I don’t have a way to measure it and would rather not buy another tool (well, rather not store another on board!)

 

[dunedin]

Good opportunity to bodge in a wrong thread …… and thereby give yourself a good excuse to replace the CAV filter holder with a better type (such as Racor).

 

[lustyd]

I’m pretty happy with the cav to be fair, aside from its location.

 

[Roberto]

It must be one of those Volvo specials: 15/32" hex head, M10.25 x 1/8" thread. RRP £49.99 including Christmas discount

 

[snowbird30ds]

Yes it looks like a UNF 3/4 and M10 are very close. I don’t have a way to measure it and would rather not buy another tool (well, rather not store another on board!)

3/4" unf is way bigger than M10.

 

[lustyd]

3/4" unf is way bigger than M10.

Sorry, should have been 3/8

 

[penberth3]

Yes it looks like a UNF 3/4 and M10 are very close. I don’t have a way to measure it and would rather not buy another tool (well, rather not store another on board!)

Have you got the screw or is it lost? You only need a steel rule. Internal threads are not as easy to measure.

 

[lustyd]

Yes I have the bolt, I’m not replacing it just buying a hose barb. The problem is it’s ambiguous what type of thread it might be and they’re all pretty similar.

 

[penberth3]

Yes I have the bolt, I’m not replacing it just buying a hose barb. The problem is it’s ambiguous what type of thread it might be and they’re all pretty similar.

I suggested a steel rule. If it's metric it will very obviously be a whole or half mm pitch. Unless it's 1.25, but that's easy to spot. Inch not so easy, but there's often a 'common factor' of threads per inch counting over a number of fractions. E.G. 28tpi, seven to a 1/4"; 24tpi, 3 to 1/8".

 

[coaster63]

Hi if you have a old r/h usually rigging wire stud they are 3/8 USF on 5mm wire. To check tread size , I would struggle to find an old USF bolt in box of bits .

 

[PaulRainbow]

The pipe threads in the side of the housing used to be imperial, then changed to metric, so it's a good bet the bleed screws did the same.

 

[xyachtdave]

I swapped my Volvo pre filter out for one of these. The access for the original glass bowl set up was terrible and changing filters a messy process.

Anyway that’s not why you rang…it claims to be like for like replacement but wasn’t. UNF fittings on new unit, unfortunately not compatible with my existing fittings and pipework. Like for like…!

I’d guess there’s no right answer to this question.

Spin On Fuel Filter Conversion Kit (CAV Replacement)

 

[lustyd]

Thanks all, much appreciated and I did expect this to be the answer but thought I’d ask anyway. I’ll try measuring and see how I get on.

 

[stav]

A cheap vernier caliper and thread pitch tool would be useful? Happy hunting


Thread pitch tool