AQ125a heat exchanger cap

[Orthas]

Hey all, First post long time reader of the forum
I am looking for a heat exchanger cap for my late 70's penta aq125a.
There is a second hand one on ebay for $100 cad but that's way too much.
The part number is 834576. Is there an alternative cap that I can buy to use or is there somewhere cheaper to purchase one?

Thanks
Jeff

 

[Scott Danforth]

you could try a standard 15 psi radiator cap

 

[Orthas]

It's slightly larger and flatter than a standard rad cap
https://www.ebay.com/itm/Volvo-834576-Heat-Exchanger-Strainer-Housing-Cap-/223113384451

 

[Orthas]

oh sorry its a aq140a not sure there's much difference anyway

 

[Scott Danforth]

there are actually about 6 radiator cap sizes that are considered "standard" per SAE J164

look at an SAE large radiator cap without venting. that would be 68mm, not the medium (56mm) or small (43mm)

 

[Orthas]

If anyone is following this, I email my local volvo penta dealer and could get a replacement for $191 so I went to my local radiator shop and got one that fit for $25 73mm blank i think it was