Re: Getting OGU roadworthy again
Posted: Tue Nov 20, 2012 12:49 am
Here is a photo of the standard adaptor (from Q.E.D) for the capillary bulb of the engine temperature gauge versus the enlarged adaptor that was made for me (I think by Vegantune of Spalding) when the water valve corroded the rear-most hole in the thermostat housing of my old cylinder head and it was cured by making the hole larger and cutting a larger thread. The larger thread is (I think) 1/2 BSP, anyway it's the standard thread of many plumbing fittings such as taps and especially the usual compression fittings for 15mm copper plumbing pipe.
This larger adaptor was too tight on its inner diameter and caused me lots of trouble because the sensor bulb seized inside it.
The strange thing is that who ever made it up, didn't really need to, because a brass thread adaptor from 1/2 BSP to 3/8 BSP is available as standard in plumbing shops. I bought this one in B&Q
The original adaptor (now lost) plus the brass thread adaptor would have solved the problem and due to its larger inner diameter would (hopefully) not have siezed around the sensor bulb.
In B&Q I also found a 3/8 blanking cap (I think 3/8 BSP) which fits onto the adaptor in place of the sensor bulb and would make it easy if necessary to run the engine without the sensor bulb inserted.
This larger adaptor was too tight on its inner diameter and caused me lots of trouble because the sensor bulb seized inside it.
The strange thing is that who ever made it up, didn't really need to, because a brass thread adaptor from 1/2 BSP to 3/8 BSP is available as standard in plumbing shops. I bought this one in B&Q
The original adaptor (now lost) plus the brass thread adaptor would have solved the problem and due to its larger inner diameter would (hopefully) not have siezed around the sensor bulb.
In B&Q I also found a 3/8 blanking cap (I think 3/8 BSP) which fits onto the adaptor in place of the sensor bulb and would make it easy if necessary to run the engine without the sensor bulb inserted.