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#1
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W109 300SEL 4.5 radiator cap
Hi all,
What is the correct radiator cap for W109, M117 4.5 year 1972? 100bar or 120bar? |
#2
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one bar = 14.5 PSI.
1450 PSI MIGHT be considered a tad excessive. The markings are for Kilopascals. One kilopascal = 0.145 PSI. I'd suggest the 100 kPa.
__________________
Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames. ― Brian P. Cleary, You Oughta Know By Now |
#3
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Thank you, is 1bar / 100 kpa original? Is there going to be a problem if using 120kpa?
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#4
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yes, the M130 wasn't designed to work that way. -CTH
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#5
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Yes, but this engine is M117
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#6
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The old cast iron M117 wasn't either. -CTH
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#7
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I found radiator number part number from EPC and it is A1235010215. On all places it is marked 120
?
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#8
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Quote:
Quote:
Quote:
1) "Is there going to be a problem if using 120kpa?" If the entire cooling system (including the heater core and its valves and hoses) were in new condition it would withstand 17-18 psi/1.2 bar/120 kpa just fine. The marking on the parts illustrated in the EPC should be understood to be the maximum operating pressure. 2) With a 50/50 ethylene glycol/water coolant 100 kpa pressurization will be sufficient to prevent formation of steam bubbles. |
#9
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Thank you for your complete answer. That sounds reasonable.
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