PFW 337V

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Captain Beke
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Thermostat Housing Pressure Cap

Post by Captain Beke » Sun Sep 24, 2017 7:17 pm

Thanks Roger / Terry
Have taken the Catchment tank out to have a better look.
Yes the stub is open to the air even with the blank cap on, and the inlet pipe goes down to the bottom , have measure capacity and it holds 1L of fluid
I have read your guide before Roger and was going to convert back to the original tank if mine was to small but 1L = 1.75 pints so will have to wait till tomorrow and refill the cooling system properly.
Should I get a new Thermostat cap from GW as per Terrys or will a replacement from QRG for my faulty one ?


1979 Red GTE 6A, Manual, overdrive, manual steering, power windows

Terry H
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Thermostat Housing Pressure Cap

Post by Terry H » Sun Sep 24, 2017 7:29 pm

If the measurements from each sealing surface to sealing surface is correct, I don't see a problem in getting a replacement from QRG as Nigel will know if it's the right one for your car.
Regards Terry H
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Captain Beke
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Thermostat Housing Pressure Cap

Post by Captain Beke » Tue Oct 10, 2017 5:50 pm

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New Thermostat caps from GW on the left and QRG on the right
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QRG on the left and GW on the right this time
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They look very similar but the QRG would not seal on my housing without extra rubber seal, the GW does ,
The QRG leaked from the rivet ( see earlier photo ) even the replacement did. The GW does not.
Both have two way pressure system for suck back so should be correct.
QRG arrived the next day and so did the replacement which he did not charge for great service from QRG
GW took 6 days to arrived but there the cap seems to work ( he also had all my details from 25 years ago pre internet so well done GW )
.
Have run it up to temp with the fan cutting in and out. I then topped up expansion tank as per Rogers instruction. The next day when it cooled down, suck back had accrued. I open thermostat housing and topped up about 1" of water ,
Last photo you can just see the level before topping up.
All thats left now is a nice long run at the weekend to see if its Happy Days and then refill with antifreeze as I have only topped up with water so far.
What is the capacity of the cooling system ? so that I get the correct % of antifreeze
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1979 Red GTE 6A, Manual, overdrive, manual steering, power windows

BusaPhill
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Thermostat Housing Pressure Cap

Post by BusaPhill » Tue Oct 10, 2017 6:22 pm

Same step up as mine.

Think my was converted by Will Sparrow.

Anyhow.
On the rad cap see those little prongs bend them at 90 degrees so they are flat.
Sorted the problem on mine (even the new cap leaked from you guessed it the brass rivet.)
Replacement cap didn't leak but needed to do the prongs to tighten it up.


1979 Scimitar SE6A V6 3.1 4speed Auto
2005 Mercedes C320 V6 3.0 7speed Auto (Diesel Daily Driver).

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peter freeman
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Thermostat Housing Pressure Cap

Post by peter freeman » Tue Oct 10, 2017 6:33 pm

Capacity 12.2 ltrs or 21.5 pints in old money



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Thermostat Housing Pressure Cap

Post by Terry H » Tue Oct 10, 2017 6:43 pm

Just put 6 ltrs of concentrate with 6 ltrs of water in my SE6.
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Thermostat Housing Pressure Cap

Post by Captain Beke » Tue Oct 10, 2017 7:05 pm

God you lot are quick with your replies
Thanks Terry, Peter and BusaPhil didn't think about bending the lugs to tighten it up, will keep that under my hat for now.
While I was waiting for replacements caps, I thought I would clean up.
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Roger Pennington
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Thermostat Housing Pressure Cap

Post by Roger Pennington » Wed Oct 11, 2017 11:31 am

That sounds like a good result! :)

On antifreeze, I always put the 6 litres of concentrate in first, then fill as required with water, that way the calculation takes account of the plain water already in the system (as you are not able to drain it 100%).


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Captain Beke
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Post by Captain Beke » Sat Mar 10, 2018 8:49 pm

Ok now an Up Date

Over heated last weekend, yes even in the snow, so had another look at my modified system.
Don't think I am getting full suck back as when I undo the thermostat cap the level never seams right to the top, so started again
Refilled as per Rogers instructions
This time put the expansion hose into a large bottle already half full with coolant, when up to temp and fan cutting in and out ,marked the level, let it cool down over night and we had suck back, about 3/4 litre
Took the cap off and the level was as full as you could get it HAPPY DAYS

Conclusion : My brass expansion tank looks nice but don't thing the inlet pipe reaches the bottom and each time I use the car I don't get full syphoning, so bought a mini washer bottle and new pipe and reinstated the system as per original
Run the car up to temp and then topped up the expansion bottle, have to wait till tomorrow to see if we have done a PROPER JOB

I have cut the bottom of the hose at an angle about 45deg's and now all I need is the correct grommet in the top ,

Anybody got one ? or where can I get one from
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1979 Red GTE 6A, Manual, overdrive, manual steering, power windows

gtcse8
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Thermostat Housing Pressure Cap

Post by gtcse8 » Sat Mar 10, 2018 9:29 pm

Think I have a couple, will look tomorrow


See the Beast on youtube under" RELIANT SCIMITAR CONVERSION LOL.,Se5,Se5a, Se6a, Two Se6b`s, GTC, SST 1800Ti & not a lot of sense

Captain Beke
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Thermostat Housing Pressure Cap

Post by Captain Beke » Sun Mar 11, 2018 7:22 pm

Thought I had this sorted,
Running the car outside my house all is fine, up to temp, fan cutting in and out, coolant expanding as should be.
When take for a drive not so good, coolant expanding and then when I stopped to check levels, with engine still running , I saw the coolant get sucked back into the engine about 3/4 litre in 10seconds, could this be a sticky thermostat I thought ? so went for anther drive 10mins no more, this time the coolant was being forced out of the expansion bottle and bubbles can be seen in the bottle .
Is it time for a new head gasket


1979 Red GTE 6A, Manual, overdrive, manual steering, power windows

gtcse8
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Thermostat Housing Pressure Cap

Post by gtcse8 » Sun Mar 11, 2018 8:33 pm

The sealing surfaces are very corroded


See the Beast on youtube under" RELIANT SCIMITAR CONVERSION LOL.,Se5,Se5a, Se6a, Two Se6b`s, GTC, SST 1800Ti & not a lot of sense

Captain Beke
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Thermostat Housing Pressure Cap

Post by Captain Beke » Tue Mar 13, 2018 8:56 pm

Should the thermostat have a small bleed hole in ,as mine hasn't ,
Also my timing gear looks like this , is it a nylon gear that needs replacing ?
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Roger Pennington
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Thermostat Housing Pressure Cap

Post by Roger Pennington » Tue Mar 13, 2018 9:30 pm

The thermostat should have a bleed hole (ideally with a "jiggle pin" ) as it allows air to escape. That does look like a nylon gear :(


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Captain Beke
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Thermostat Housing Pressure Cap

Post by Captain Beke » Tue Mar 13, 2018 9:54 pm

Thanks Roger,

Going to do a compression test and a sniff test to confirm if I need a head gasket.
If the engine needs to be pulled apart I might even have it tickled a bit to increase it's performance. It already has tubular manifolds, big exhaust pipes, elec fuel pump, ignition, spax shocks, new radiator / water pump, just the brakes and the engine to upgrade.

What state of tune have you got in Yellow Peril ?


1979 Red GTE 6A, Manual, overdrive, manual steering, power windows

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