3.8 Engine rebuild
#281
The other is for top gear - that's the one in the overdrive circuit. If the two switches aren't accessible when the gearbox is installed in your car, check they are working first and if you have to replace them, check the replacements work. I've not heard of problems in Jaguars, but MG owners, their cars have nominally the same devices, often have to replace/adjust them with a spacer.
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Glyn M Ruck (09-02-2024)
#282
#283
Overdrive (or a fifth gear in general) is nice to have for cruising and allows a rapid down change for overtaking. O/d top pulls adequately down to 40 m/h. In a light vehicle, it's not unreasonable to use the reverse switch on the gearbox as an inhibitor and make the overdrive accessible in lower gears. Though, with a JS or CR Moss box, the overall ratio of overdrive 3rd is very close to direct top.
Last edited by Peter3442; 09-03-2024 at 07:21 AM.
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Glyn M Ruck (09-04-2024),
S-Type Owner (09-03-2024)
#284
I had an MGB GT V8 with overdrive in 3rd and 4th. Ideal for overtaking as already stated and often I would use it on "A" roads where I never touched the gear stick just kept flicking the O/D on and off through 3rd and 4th.
My father in the 1960s used to sprint and hill climb a 3.8 Mk2 and he set the O/D up so it worked in all forward gears. He would set off from the line in a standing start in first and then flicked the O/D into what is the equivalent of 2nd and this would get him up to about 60 mph without having to change gear using the gear stick or clutch.
My father in the 1960s used to sprint and hill climb a 3.8 Mk2 and he set the O/D up so it worked in all forward gears. He would set off from the line in a standing start in first and then flicked the O/D into what is the equivalent of 2nd and this would get him up to about 60 mph without having to change gear using the gear stick or clutch.
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Glyn M Ruck (09-04-2024)
#287
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All of the eleven 2.4, 3.4 and 3.8 Jags I have owned used Lucas generators.
I suspect your Delco is a "ring in".
I did convert a couple of these cars to alternators. I recommend this to owners who have major generator failures such as burnt windings and poling where bearings have failed as the cost to rebuild the old generator can be eye watering.
I suspect your Delco is a "ring in".
I did convert a couple of these cars to alternators. I recommend this to owners who have major generator failures such as burnt windings and poling where bearings have failed as the cost to rebuild the old generator can be eye watering.
The following 3 users liked this post by Bill Mac:
#288
All of the eleven 2.4, 3.4 and 3.8 Jags I have owned used Lucas generators.
I suspect your Delco is a "ring in".
I did convert a couple of these cars to alternators. I recommend this to owners who have major generator failures such as burnt windings and poling where bearings have failed as the cost to rebuild the old generator can be eye watering.
I suspect your Delco is a "ring in".
I did convert a couple of these cars to alternators. I recommend this to owners who have major generator failures such as burnt windings and poling where bearings have failed as the cost to rebuild the old generator can be eye watering.
#289
#290
Not sure it is worth the hassle of rebuilding the water pump when they only cost £94 from EBay. https://www.ebay.co.uk/itm/224463631...R3MLaFoHAAAAAA
A rebuild kit is £50.
A rebuild kit is £50.
#291
It's a job I have to do on my car as the pump is locked solid. While you're working on it, it's worth replacing everything that's consumable such as hoses, if you haven't done so already, and also flushing the cooling system.
Make sure the sealing surfaces are good and the gasket sits well between solid metal surfaces otherwise coolant can leak into the engine oil via the timing gear.
Make sure the sealing surfaces are good and the gasket sits well between solid metal surfaces otherwise coolant can leak into the engine oil via the timing gear.
The following 2 users liked this post by Peter3442:
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Glyn M Ruck (09-17-2024)
#292
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Cass
Would like to have been able to buy the new water pump you recommended in post #290 but on closer inspection of the site, the company does not post to Australia.
Even if they did the cost of postage would almost, for sure, have doubled the quoted price.
Ah, well, we in the "colonies" will just have to make and mend.
Cheers
Would like to have been able to buy the new water pump you recommended in post #290 but on closer inspection of the site, the company does not post to Australia.
Even if they did the cost of postage would almost, for sure, have doubled the quoted price.
Ah, well, we in the "colonies" will just have to make and mend.
Cheers
#293
The water pump I have was new (NOS), the bearings are in excellent condition, it's the seal that's bad. I've located a replacement seal based on the original seals size, that would be a cheap fix. However, all the rebuild kits I've seen come with a replacement impeller, they must break during removal. I'll experiment with a worn out 4.2 pump I have, maybe the impeller can be removed without damage.
Last edited by jayd2; 09-20-2024 at 08:29 PM.
#294
Cass
Would like to have been able to buy the new water pump you recommended in post #290 but on closer inspection of the site, the company does not post to Australia.
Even if they did the cost of postage would almost, for sure, have doubled the quoted price.
Ah, well, we in the "colonies" will just have to make and mend.
Cheers
Would like to have been able to buy the new water pump you recommended in post #290 but on closer inspection of the site, the company does not post to Australia.
Even if they did the cost of postage would almost, for sure, have doubled the quoted price.
Ah, well, we in the "colonies" will just have to make and mend.
Cheers
#295
The water pump I have was new (NOS), the bearings are in excellent condition, it's the seal that's bad. I've located a replacement seal based on the original seals size, that would be a cheap fix. However, all the rebuild kits I've seen come with a replacement impeller, they must break during removal. I'll experiment with a worn out 4.2 pump I have, maybe the impeller can be removed without damage.
Rgds
David
#296
Join Date: Nov 2012
Location: Joyner, Queensland, Australia
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Glyn M Ruck (09-23-2024)
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