Expansion tank cap relieving pressure
#1
Expansion tank cap relieving pressure
Hi guys. New to the forum with a bit of an OT question; hope you can help. I am attempting to use a Volvo sourced coolant expansion tank in a custom application on my vintage `69 Lotus Plus 2. Ideally I would like the relieving pressure of my cooling system to be between 7 and 15 psi, which is where the Lotus Twin Cam is happy.
The expansion tank is a flat looking affair, with (I think) OEM part number 463604 or 9142000. The tank looks like the one on the allautoparts.ru site with their part number 51.2000. I believe the compatable expansion cap has a M45x3 thread; the one I presently have is rated to relieve at 1.5 BAR, 21.75 psi, 150 kPa. The caps appear to be common across a wide variety of Volvo models circa 1986 to 2000`s. They appear to be available in various colours, but not sure if this relates to their relieving pressure.
I saw some similar looking caps on a British eBay site with 0.5 Bar and 0.75 Bar, but not sure if these fit or not.
Questions:
Is there a compatable cap that will relieve at a lower pressure available.
If so, what pressure.
What would be a part number or at least a Volvo model call-up I could use to find the available cap.
Thanks in advance. Hope I picked the correct model forum.
Volvo content: The Lotus uses similar carbs to the Volvo 122
Stu
Calgary Alberta
The expansion tank is a flat looking affair, with (I think) OEM part number 463604 or 9142000. The tank looks like the one on the allautoparts.ru site with their part number 51.2000. I believe the compatable expansion cap has a M45x3 thread; the one I presently have is rated to relieve at 1.5 BAR, 21.75 psi, 150 kPa. The caps appear to be common across a wide variety of Volvo models circa 1986 to 2000`s. They appear to be available in various colours, but not sure if this relates to their relieving pressure.
I saw some similar looking caps on a British eBay site with 0.5 Bar and 0.75 Bar, but not sure if these fit or not.
Questions:
Is there a compatable cap that will relieve at a lower pressure available.
If so, what pressure.
What would be a part number or at least a Volvo model call-up I could use to find the available cap.
Thanks in advance. Hope I picked the correct model forum.
Volvo content: The Lotus uses similar carbs to the Volvo 122
Stu
Calgary Alberta
#2
Yes, the colors are related to pressure.
If the threads are correct you would want the green one.
http://www.ipdusa.com/Volvo-940960/H...p-136-274-418/
If the threads are correct you would want the green one.
http://www.ipdusa.com/Volvo-940960/H...p-136-274-418/
#3
Thanks Phil for the link.
The two caps shown look like what I need size wise.
Just to confirm, the green one (150 kPa - 1.5 bar - 21 psi) is what I have now. Looks like the black one (75 kPa - 0.75 bar - 10.9 psi) is what I need. The Lotus TC stock pressure range is I believe 7 to 12 psi.
Is the black one's part number 1357775 a dealer part number? I suppose the local dealer would find one if I specify for a 1985-1995 940 model?
Thanks again.
The two caps shown look like what I need size wise.
Just to confirm, the green one (150 kPa - 1.5 bar - 21 psi) is what I have now. Looks like the black one (75 kPa - 0.75 bar - 10.9 psi) is what I need. The Lotus TC stock pressure range is I believe 7 to 12 psi.
Is the black one's part number 1357775 a dealer part number? I suppose the local dealer would find one if I specify for a 1985-1995 940 model?
Thanks again.
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