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#1
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Oil Cooler Drain
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Graham 85 300D ![]() |
#2
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It looks like BSPP ( British Standard Pipe Parallel ) but could be a DIN / ISO / German equivalent. Go to Discount Hydraulic Hose and look at their thread ID PDF.
On the plug, where the threads hit the under head hex, there should be a slight taper from the hex to the threads. ( this is a reverse of a tapered seat spark plug. ) The outer sharp edge bites into the soft aluminum cooler boss. This is typical for BSPP in soft metals. If used on steel, a sealing washer is used. This should plug screw in easily until the under head hits the boss so you have a thread issue that needs addressed. |
#3
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New rad and cooler now in. Job complete. No leaks yet!
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Graham 85 300D ![]() Last edited by Graham; 06-18-2017 at 04:18 PM. |
#4
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Don't count on Germans not using BSPP , I recently speced out our 4th stamping press hydraulic clamp system and the clamp cylinders use BSPP. The system is made by HILMA Römheld GmbH Schützenstraße 74, 57271 Hilchenbach, Germany What looks to be an O ring receiver on the plug is likely the tapered area that bites into the cooler boss creating a seal. On harder materials, the tapered area also deforms to complete the seal. Generally, for an o ring type seal ( Like Boss SAE o ring ) there is a tapered area above the female threads that will capture the o ring so none of it is exposed. This type of fitting will almost seal on it's own without an o ring. Cutting the plug only is possible but not typical practice for most standards. |
#5
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Quote:
By the way, what little cone there is under the hex head is same diameter as the threads, so that is not how it seals.
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Graham 85 300D ![]() Last edited by Graham; 06-19-2017 at 09:48 AM. |
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