Thread of Volvo 2030B impeller cover screws

[Chanquete]

For my Volvo 2030B I am trying to figure out the data of the thread of the impeller cover screws.
As spare parts kit, they are offered as part number 21951302. I suppose thread M4 0.5. A measure difficult to get.
I have tried without success M4 0.7 and 5/32
Thanks in advance!

 

[tillergirl]

Not that it will give you an answer, when I bought a Speedseal, the guy asked the details of my water pump because it needed a choice of thread. Unfortunately I can't recall the choices but he got it right. Also later when I bought a service kit (shaft and seals) Keynote supplied the wrong parts. I thing the 2030B used three difference water pumps. I have the old screws but they are on board at the moment.

Dug out the invoice for the service parts, my pump is a Jabsco 29450-1301 (https://www.jabscoshop.com/jabscoshop-spare-parts/29450-1301-pump-20mm-brz-20-flange.htm). There was also a Johnson pump also fitted on the 2030B.

Here is my Jabsco. P1010352 by Roger Gaspar, on Flickr

Obviously I have the Speedseal fitted.

 

[VicS]

For my Volvo 2030B I am trying to figure out the data of the thread of the impeller cover screws.
As spare parts kit, they are offered as part number 21951302. I suppose thread M4 0.5. A measure difficult to get.
I have tried without success M4 0.7 and 5/32
Thanks in advance!

I dont quite understand your post but you seem to be saying that the screws are listed as M4 x 0.5 .......... If so that is no mystery. M4 x 0.5 is a fine pitch metric thread. The more common coarse pitch thread is M4 x 0,7

 

[Chanquete]

I dont quite understand your post but you seem to be saying that the screws are listed as M4 x 0.5 .......... If so that is no mystery. M4 x 0.5 is a fine pitch metric thread. The more common coarse pitch thread is M4 x 0,7

Hello Vics
I didnt say that the screws were listed as M4x 0.5. I only supose it after trying M4x0.7.
If somebody culd confirm it I will have the data for buying these screws.

 

[duncan99210]

They’re metric, 4mm x 0.5 thread. I had to recut the threads on one of mine and used that size of tap to do it. Worked fine with the original screw.

 

[Chanquete]

They’re metric, 4mm x 0.5 thread. I had to recut the threads on one of mine and used that size of tap to do it. Worked fine with the original screw.

Thank you Duncan!.
This data is exactly what I need!

 

[Chanquete]

Not that it will give you an answer, when I bought a Speedseal, the guy asked the details of my water pump because it needed a choice of thread. Unfortunately I can't recall the choices but he got it right. Also later when I bought a service kit (shaft and seals) Keynote supplied the wrong parts. I thing the 2030B used three difference water pumps. I have the old screws but they are on board at the moment.

Dug out the invoice for the service parts, my pump is a Jabsco 29450-1301 (https://www.jabscoshop.com/jabscoshop-spare-parts/29450-1301-pump-20mm-brz-20-flange.htm). There was also a Johnson pump also fitted on the 2030B.

Here is my Jabsco. P1010352 by Roger Gaspar, on Flickr

Obviously I have the Speedseal fitted.

Thank you Tillergirl!

 

[colhel]

If you're looking for replacements ... https://www.keypart.com/stock/21951302-r