Tonyloz Posted February 6, 2017 Report Share Posted February 6, 2017 Hi all Ive read somewhere that you have to restrict the bypass hose..is that correct? Ive a standard type 88 degree stat fitted Thanks Tony Quote Link to post Share on other sites
Fireman049 Posted February 6, 2017 Report Share Posted February 6, 2017 (edited) Hi Tony ~ If you've got a 'bellows' type thermostat fitted there is no need to put a restrictor in the by-pass outlet. If you've got a non-bellows thermostat then you'll need to fit a restrictor. This is how I did it in my 3A. Tom. Edited February 6, 2017 by Fireman049 Quote Link to post Share on other sites
stuart Posted February 6, 2017 Report Share Posted February 6, 2017 Hi all Ive read somewhere that you have to restrict the bypass hose..is that correct? Ive a standard type 88 degree stat fitted Thanks Tony 88 Is a bit high for summer use. 86 more appropriate. TBH I have never bothered with a restrictor and havent noticed any difference. Just make sure that whichever thermostat you use has a bleed hole and fit that uppermost. Stuart. Stuart. Quote Link to post Share on other sites
Lebro Posted February 6, 2017 Report Share Posted February 6, 2017 Hi Tony ~ If you've got a 'bellows' type thermostat fitted there is no need to put a restrictor in the by-pass outlet. If you've got a non-bellows thermostat then you'll need to fit a restrictor. This is how I did it in my 3A. Tom. DSCF2234 - Copy.JPG DSCF2228 - Copy - Copy.JPG To expand on Tom's answer, The original setup intended for these cars is no restriction in the bypass circuit, but a thermostat which has a sleeve which moves as the water gets hot to cover over the bypass port in the thermostat housing. As far as I know these "sleeved" thermostats were always the bellows type. They are still available. Bob. Quote Link to post Share on other sites
M. Pied Lourd Posted February 6, 2017 Report Share Posted February 6, 2017 (edited) I have a regular style thermostat in my 60. I drilled a small hole in a copper pipe capping plug that I picked up at the hardware store and inserted it in the bypass hose. Seems to work... Cheers Tush Edited February 6, 2017 by M. Pied Lourd Quote Link to post Share on other sites
Bill.P. Posted February 7, 2017 Report Share Posted February 7, 2017 Are they still available Bob? Or do you mean N O S ? Can you say where, or have I missed something? Bill P. Quote Link to post Share on other sites
EdwinTiben Posted February 7, 2017 Report Share Posted February 7, 2017 Hi bill They are reproduced http://www.moss-europe.co.uk/thermostat-72-c-bellows-type-107590.html Quote Link to post Share on other sites
Lebro Posted February 7, 2017 Report Share Posted February 7, 2017 (edited) There are also many available NOS, Always seen some at the autojumbles at the internationals, & at Brooklands etc. Bob. PS & they are usually a lot less than £70 ! Edited February 7, 2017 by Lebro Quote Link to post Share on other sites
stuart Posted February 7, 2017 Report Share Posted February 7, 2017 Tractor autojumbles often yield them too as they were also standard fitting on grey Fergies and a whole range of that era commercials. Stuart. Quote Link to post Share on other sites
Hamish Posted February 7, 2017 Report Share Posted February 7, 2017 (edited) You want to search eBay for something like this. http://m.ebay.co.uk/itm/130875523975?_trkparms=aid=222007&algo=SIC.MBE&ao=1&asc=20150313114020&meid=fb53db9c1d1b40d2affd9e917a75d889&pid=100338&rk=5&rkt=6&sd=112275464945&_trksid=p2141725.c100338.m3726&_mwBanner=1 You just need to check the temp range on them. Bedford tk uses similar Sellers seem to price according to vehicle. So the jag one is double the price. But the same thing. They are about H Edited February 7, 2017 by Hamish Quote Link to post Share on other sites
Tonyloz Posted February 7, 2017 Author Report Share Posted February 7, 2017 Hi Tony ~ If you've got a 'bellows' type thermostat fitted there is no need to put a restrictor in the by-pass outlet. If you've got a non-bellows thermostat then you'll need to fit a restrictor. This is how I did it in my 3A. Tom. DSCF2234 - Copy.JPG DSCF2228 - Copy - Copy.JPG Quote Link to post Share on other sites
Tonyloz Posted February 7, 2017 Author Report Share Posted February 7, 2017 Thanks for the reply What size is the orifice? Tony Quote Link to post Share on other sites
Lebro Posted February 7, 2017 Report Share Posted February 7, 2017 You want to search eBay for something like this. http://m.ebay.co.uk/itm/130875523975?_trkparms=aid=222007&algo=SIC.MBE&ao=1&asc=20150313114020&meid=fb53db9c1d1b40d2affd9e917a75d889&pid=100338&rk=5&rkt=6&sd=112275464945&_trksid=p2141725.c100338.m3726&_mwBanner=1 They are about H Sorry, but that example does not have the important sleeve Bob. Quote Link to post Share on other sites
mjdearing Posted February 7, 2017 Report Share Posted February 7, 2017 I have been selling these bellows stats now for around 30yrs to members for half the market price ,i did have a endless supply but my usa contact died so on literally the last few now. PM if you need one Tony. Cheers Martin Quote Link to post Share on other sites
Fireman049 Posted February 7, 2017 Report Share Posted February 7, 2017 Tony ~ The hole is approx. 1/8th". Tom. Quote Link to post Share on other sites
peejay4A Posted February 7, 2017 Report Share Posted February 7, 2017 Slightly off topic but if you do go for a bellows type thermostat don't fit a radiator cap of more than 7psi or the 'stat won't open properly. Quote Link to post Share on other sites
tim hunt Posted February 7, 2017 Report Share Posted February 7, 2017 I have always had a problem getting my 4A to run hot enough, even without a radiator duct fitted and with a 91 deg C stat fitted all year round. In winter months I frequently resort in addition to blanking off the lower half of the radiator. Some years ago I picked up an original bellows type stat for £3 at an autojumble to try out but if anything it made the car run even cooler so I switched back to the conventional type stat. I had read of the possible beneficial effect of a by pass restrictor and made up a suitable item but never got round to fitting it. I will try it and report back. Tim Quote Link to post Share on other sites
peejay4A Posted February 7, 2017 Report Share Posted February 7, 2017 I would have thought that restricting the bypass would make it run even cooler as more coolant goes through the radiator... Quote Link to post Share on other sites
Lebro Posted February 7, 2017 Report Share Posted February 7, 2017 +1 that's usually the idea ! Most TR owners have TRouble with overheating, not under heating. If it seems to be running cold, even with a known good thermostat, then I would want to check the temperature gauge. Bob. Quote Link to post Share on other sites
Nigel C Posted February 8, 2017 Report Share Posted February 8, 2017 if it seems to be running cold I'll sell mine and buy yours! Quote Link to post Share on other sites
Hamish Posted February 8, 2017 Report Share Posted February 8, 2017 Sorry, but that example does not have the important sleeve Bob. Thanks for pointing that out. It's not something I'd noticed. H Quote Link to post Share on other sites
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