coxy123 Posted May 29, 2023 Report Share Posted May 29, 2023 My fan belt is slipping when you get to higher revs. I've tried swapping it for a new one but the adjustments are maxed out. What am I missing. Cheers Link to comment Share on other sites More sharing options...
dougbgt6 Posted May 29, 2023 Report Share Posted May 29, 2023 Coxy, What car is it? Doug Link to comment Share on other sites More sharing options...
coxy123 Posted May 29, 2023 Author Report Share Posted May 29, 2023 1500 spitfire Link to comment Share on other sites More sharing options...
cliff.b Posted May 29, 2023 Report Share Posted May 29, 2023 What size fan belt is fitted? Link to comment Share on other sites More sharing options...
KevinR Posted May 29, 2023 Report Share Posted May 29, 2023 3 minutes ago, cliff.b said: What size fan belt is fitted? And what size is the water pump pulley ? It's possible that you have a fan belt that is too long, or you have a water pump from a spitfire/herald that has a smaller pulley (as used on cars fitted with a Dynamo rather than an alternator. Link to comment Share on other sites More sharing options...
coxy123 Posted May 29, 2023 Author Report Share Posted May 29, 2023 When you pull it out it's 20'' It was part of a service kit from the club Avx10 1087 la Link to comment Share on other sites More sharing options...
coxy123 Posted May 29, 2023 Author Report Share Posted May 29, 2023 Water pump pulley is 4'' Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 29, 2023 Report Share Posted May 29, 2023 1087 is the the belt length in mm you need to buy a belt that is a bit shorter or modify your adjusting straps to suit with all the mix and swap that goes on whats in the parts list can be irrelevant has it dynamo or alternator ??? lots of things change over the years Pete Link to comment Share on other sites More sharing options...
coxy123 Posted May 29, 2023 Author Report Share Posted May 29, 2023 Alternator. I was thinking of extending adjustment slot on alternator bkt Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 29, 2023 Report Share Posted May 29, 2023 if there is room to extend the slot thats fine Pete Link to comment Share on other sites More sharing options...
KevinR Posted May 29, 2023 Report Share Posted May 29, 2023 32 minutes ago, coxy123 said: Water pump pulley is 4'' Which means you have the wrong water pump for a 1500. The GWP200 has a 4" pully and is for the MKIII Spitfire and earlier. The GWP128 has a 5.25" pully and is for MKIV and 1500 Spitfires. There are three possible fixes : 1. Replace the water pump for the correct one 2. Fit a shorter fan belt 3. Extend the adjustment slot in the arm. Ideally, you should replace the pump, as with the smaller pulley, the pump is rotating faster than Triumph intended. Link to comment Share on other sites More sharing options...
cliff.b Posted May 29, 2023 Report Share Posted May 29, 2023 My 1500 has the water pump with the smaller pulley and when I bought it, also had an older, heavier, 4 blade metal fan. I had the same problem with belt squealing when revving engine but got around it by fitting a lighter 7 blade plastic one. Less inertia, I presume. Link to comment Share on other sites More sharing options...
johny Posted May 29, 2023 Report Share Posted May 29, 2023 Wonder if the smaller pump pulley also means less belt contact area plus higher pump turning torque required? Link to comment Share on other sites More sharing options...
coxy123 Posted May 29, 2023 Author Report Share Posted May 29, 2023 Definitely a smaller pulley. How do I check that it is a 1500 engine. Starting to worry now Link to comment Share on other sites More sharing options...
KevinR Posted May 29, 2023 Report Share Posted May 29, 2023 5 minutes ago, coxy123 said: Definitely a smaller pulley. How do I check that it is a 1500 engine. Starting to worry now What's the engine number ? Link to comment Share on other sites More sharing options...
coxy123 Posted May 29, 2023 Author Report Share Posted May 29, 2023 Where do I find it Link to comment Share on other sites More sharing options...
KevinR Posted May 29, 2023 Report Share Posted May 29, 2023 Link to comment Share on other sites More sharing options...
johny Posted May 29, 2023 Report Share Posted May 29, 2023 Engine number stamped not cast on a upward facing surface of the block near to its joint with the cylinder head... Link to comment Share on other sites More sharing options...
KevinR Posted May 29, 2023 Report Share Posted May 29, 2023 If it starts in FM, its a genuine Spitfire 1500 engine. It it starts in YC, its a Dolomite 1500 engine that has been fitted to your Spitfire. Any other prefix and its going to be a 1300 engine (or smaller) Link to comment Share on other sites More sharing options...
coxy123 Posted May 29, 2023 Author Report Share Posted May 29, 2023 FM96366HF Link to comment Share on other sites More sharing options...
coxy123 Posted May 29, 2023 Author Report Share Posted May 29, 2023 That's something then. I'm going to Silverstone, so could I get a 1300 belt until I can change pump Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 29, 2023 Report Share Posted May 29, 2023 just extend the strap or obtain a belt 10mm shorter then change the pump when its needed if the current pump is quiet and not leaking pete Link to comment Share on other sites More sharing options...
cliff.b Posted May 29, 2023 Report Share Posted May 29, 2023 21 minutes ago, KevinR said: If it starts in FM, its a genuine Spitfire 1500 engine. It it starts in YC, its a Dolomite 1500 engine that has been fitted to your Spitfire. Any other prefix and its going to be a 1300 engine (or smaller) My engine starts DM and ends ESS which I believe was a factory supplied 1500 replacement engine at some point. Link to comment Share on other sites More sharing options...
cliff.b Posted May 29, 2023 Report Share Posted May 29, 2023 45 minutes ago, johny said: Wonder if the smaller pump pulley also means less belt contact area plus higher pump turning torque required? That was my assumption when looking at mine. Link to comment Share on other sites More sharing options...
coxy123 Posted May 29, 2023 Author Report Share Posted May 29, 2023 Thanks for your help guys Link to comment Share on other sites More sharing options...
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