Does anyone know the thread size ......

[mk1fan]

........ of the two coolant sensors just above the thermostat housing on a 2.9?

Thanks.

[phillpot]

I reckon the smaller one (gauge sender) is 1/8 NPT which is 27tpi.


Larger one (ECU) is 17mm fine thread, 1.5mm thread pitch.


but don't take my word for it!

[mk1fan]

Thanks for the starting point. Got to clean out the threads on the cleaned up manifold prior to fitting. Think I'll buy some replacement sensors and take all three to my friendly engineering shop.

[phillpot]

Found my decent thread gauges, nowt wrong with the big one but the small one is looking more like 1/8 BSP (28 TPI)


You mentioned 3 ? there is a third hole with a blanking plug on mine, 1/4 BSP (18 TPI) (19 TPI)

Edited by phillpot on Tuesday 15th March 10:21

[mk1fan]

The manifold and two sensors. Need to get the threads cleaned out.

[TVRees]

phillpot said:

... 1/4 BSP (18 TPI)

Shouldn't that be 1/4 BSP (19 TPI) ?

See HERE

[phillpot]

TVRees said:

Shouldn't that be 1/4 BSP (19 TPI) ?

Oops, yes it should!

Beginning to wish I'd never started this (I blame the very small writing on my thread gauges)

[glenrobbo]

I find as you get older, the number of teeth diminishes.

And the eyesight starts to fade as well.....







Mike, the G.T.S. is waiting for you!



Perhaps I'd better put it like this:

Mike, the G.T.S. is waiting for you!

Edited by glenrobbo on Tuesday 15th March 11:02

[phillpot]

It can wait a bit longer (but not that long I fear).....