Talk Morgan Forums Morgan Sports Cars Maintenance & Servicing Coolant system flush and antifreeze change.

I fitted the SiFab version a few years ago, but it felt undersized for the hoses and a sloppy fit

18mm is difficult to find, these do a 19

https://www.merlinmotorsport.co.uk/p/aluminium-barbed-t-piece-for-19mm-3-4-inch-bore-hose-mhj-t19?v

Cast aluminium and 17.5mm at the barb.




Worth a try for £4.83 delivered.

Wow, that really is a bargain, compared to the one in my previous post which at £25 must be made of unobtainium.....

Yeah, I'm not paying £25 for a simple T-Piece

A fiver seemed like the right money to me, and being cast aluminium it should prove reliable, here's a link to the listing:

https://www.aliexpress.com/item/400...er_list.order_list_main.4.15c31802Py20c5

Also, the way I see it the expensive TiGed up version is only as good as its weld, while the substantially cheaper cast one has no welds to leak or fail

Working on the principle that it's always best to check your work, let's first understand the advice given by the antifreeze manufacturer themselves.

Prestone say a 50/50 mix of thier antifreeze (concentrate) and water will protect Monty's engine down to approximately -37°C, they also say for optimal performance and corrosion protection, it is recommended to use deionized or distilled water when mixing the concentrate. They then go on to say users should not allow the concentration of antifreeze to fall below 40%, or exceed 60% as engine parts could become damaged.

With all that understood, let's see what what my old school specific gravity type tester says?



I'm seeing a reading that's in the middle of -29c and -37c here, so that would be a true reading of -33c. Ok, so it's not quite the -37 quoted by Prestone, but the gauge doesn't offer the most defined indecies so I could actually be at -34c or even -35c depending on how I hold and view it, either way it's clear my dilution is certaily well above the recomended 40% minimum.

My tester also states for protection down to -34 you need a 50/50 mix, so if anything, and being hyper critical here, I must only be a tiny fraction under the optimal 50/50 mix.



Gven this, and the fact Monty doesn't live in Alaska, I'm confident being protected down to at least -33c is more than sufficient, and the dilution I carefully calculated is, 'as near as damn it', perfect

I think that's all correct Dave, the more sophisticated measuring equipment has an adjustment scale for temperature and I'll bet if you tried it on that you'd be spot on!

As with any measuring instrument, it's only as good as its calibration.

I'm not convinced a refratometer type antifreeze gauge is any more accurate than a specific gravity type. However, I do conceed the indecies would likely be way more clear, for this reason alone it would very likely offer a more precise reading.

I may buy a refratometer as they've become quite affordable of late, I note you can now buy one for around £7.00 from our friends at Temu.

The £4.83 aluminium T-piece finally arrived today from China land.

And it looks good quaily too



I experienced minimal loss of coolant by simply deploying my hose clamp.



All fitted in 10 minutes, and I'm pleased to confirm it's a perfect fit.



I finished the job off with a carefully cut (hidden) foam block to avoid rattles and vibrational stress on the aluminium T-piece.





Happy with that, and for less than a fiver it's a known failure point removed for sensible money

Yes I did it on my trad for the same reason. S1 Roadster.