Dave McCulloch Posted February 1, 2006 Share Posted February 1, 2006 Last night I went to fit the belt on my newly fitted dry sump (K series), and concluded CC had sent the wrong length belt (a 3PK763). Phoned CC today who confirmed it was the correct belt, and was so tight that it needed "winding" onto the pulleys by turning the engine. Using this technique I've got the belt on, but I can slide the retaining pin in and out of the hole in the tensioner (even after turning the engine over several times) - ie the tensioner seems to be jammed back against its end stop. This doesn't look right to me - can somebody pls confirm the belt length I should be using. Thanks Dave Link to comment Share on other sites More sharing options...
Allen Payne Posted February 2, 2006 Share Posted February 2, 2006 I don't know the number but I do remember it being very tight to get it on/off. Link to comment Share on other sites More sharing options...
TomB Posted February 2, 2006 Share Posted February 2, 2006 I use a 3PK825 belt. Link to comment Share on other sites More sharing options...
Dave McCulloch Posted February 2, 2006 Author Share Posted February 2, 2006 Thanks Tom - I'll try one of them. Dave Link to comment Share on other sites More sharing options...
Mathew Rimmer Posted February 2, 2006 Share Posted February 2, 2006 Just checked mine (not yet fitted) its 3KR763 (by a company called Lemforder) as supplied with the Caterham d/sump kit Link to comment Share on other sites More sharing options...
Jason Plato Posted February 2, 2006 Share Posted February 2, 2006 just checked mine = 3pk820 gold pump , ally pulley . Link to comment Share on other sites More sharing options...
Dave McCulloch Posted February 2, 2006 Author Share Posted February 2, 2006 Cheers Just ordered a 3PK825 from local motor factors - they don't keep them in stock but will have it in tomorrow for me. Dave Link to comment Share on other sites More sharing options...
TomB Posted February 3, 2006 Share Posted February 3, 2006 Is it sad when you know the belt code off by heart? Link to comment Share on other sites More sharing options...
mav Posted February 3, 2006 Share Posted February 3, 2006 Considering the stick you have given me in ther past, I think you know the answer Mr B! Link to comment Share on other sites More sharing options...
TomB Posted February 3, 2006 Share Posted February 3, 2006 Have I ever taken the micheal? Link to comment Share on other sites More sharing options...
mav Posted February 3, 2006 Share Posted February 3, 2006 Just once or twice... Link to comment Share on other sites More sharing options...
Dave McCulloch Posted February 3, 2006 Author Share Posted February 3, 2006 Mmmm - 3PK825 is waaaay too long. And I really struggled to get the 763 off. Need to find if there's one in between... Seems strange that people are using a range of belt sizes. I have the current gold pump with the r500 ally flanged pulley. I assume all Rover crank pulleys are the same diameter? (the engine started life in an mgf). Back to the motor factors again tomorrow. Dave Link to comment Share on other sites More sharing options...
Mathew Rimmer Posted February 4, 2006 Share Posted February 4, 2006 Tried fitting my belt, quite tight so wound it on cranking the engine, then pulled the pin out of the tensioner wheel and it sprung upwards away from the belt which went slack ! The wheel is in the middle of the belt not catching either the top or the bottom of the belt. Gold pump, crank pulley is stepped with a larger ring for the cambelt and smaller ring in front for this belt. What am I doing wrong !! Link to comment Share on other sites More sharing options...
Dave McCulloch Posted February 4, 2006 Author Share Posted February 4, 2006 Matthew When you wind the belt on, it goes around the scavenge pump and crank pulleys, with the outer face of the lower belt run above the tensioner pulley. When you release the temsioner pulley it springs upwards and takes up any slack. I persuaded the 763mm supplied belt on, and all now seems well. Just finished fitting it all this afternoon with a bracket and microswitch added to proved a thrown belt warning. Dave Link to comment Share on other sites More sharing options...
Support Team Shaun_E Posted February 6, 2006 Support Team Share Posted February 6, 2006 Dave - mine is really tight as well and I use the "winding on" technique. I think I've even taken the pulley off to fit the belt. doesn't seem to be a problem in use though. Yellow SL #32 Link to comment Share on other sites More sharing options...
Dave McCulloch Posted February 6, 2006 Author Share Posted February 6, 2006 Shaun Thanks for the confirmation - I did indeed use the winding on technique, and started the engine up yesterday morning. Belt seemed quite happy. Unfortunately I'd obviously not tightened the jubilee clip enough where the J pipe meets the submarine pipe - result - the submarine pipe was pushed out of the J pipe by the coolant pressure resulting in coolant spraying everywhere . Will try again tonight.... Dave Link to comment Share on other sites More sharing options...
SimonMac Posted February 6, 2006 Share Posted February 6, 2006 Hi Dave, any chance of posting details of the microswitch part number and supplier? Link to comment Share on other sites More sharing options...
Dave McCulloch Posted February 6, 2006 Author Share Posted February 6, 2006 Simon The microswitch came from Maplin. I'll post the part No tonight, together with some photos if Fotopic decides its going to work! Dave Link to comment Share on other sites More sharing options...
Peter Carmichael Posted February 6, 2006 Share Posted February 6, 2006 With the sprung tensioner and the gold pump and a standard or R500 front pulley, 763 is the correct length. Link to comment Share on other sites More sharing options...
Dave McCulloch Posted February 6, 2006 Author Share Posted February 6, 2006 Simon I made up a bracket the same as V7 SLR - so I can't take any credit for the design. Details are on this thread here. The part number of the microswitch I used was GW73Q from Maplin - £1.19 each. I fitted a new warning light above the oil pressure gauge - I used a high intensity LED (N22BY - 70p each) which needs a resistor in series to limit the current (current remember the value offhand, but if you want to know mail me). The resistor is wired to the microswitch and a 30psi low pressure switch in a remote T piece, so the LED lights if either the belt is thrown or the OP drops below 30psi. There's absolutely no way I'll miss that LED coming on - though it might well burn out my retinas at night . If you want any more info, mail me or post below. Dave Edited by - Dave McCulloch on 6 Feb 2006 22:43:02 Link to comment Share on other sites More sharing options...
SimonMac Posted February 7, 2006 Share Posted February 7, 2006 Thanks for the info. Dave Could you let me know how you mounted the LED in the dash, and the value of the resistor? I guess the circuit for the belt microswitch is completely separate to the circuit for the OP switch? Link to comment Share on other sites More sharing options...
Dave McCulloch Posted February 8, 2006 Author Share Posted February 8, 2006 Simon I drilled an 8mm hole in the dash (centrally above the oil pressure gauge), and mounted the 5mm LED using an LED clip (Maplin part No. UK14Q). The in-line resistor you need for LED N22BY is 240 ohm (maplin part no. M240R). I wired the LED positive lead via the resistor to the back of the ignition switch (adjacent to the two white wires, same connector as the shift light is wired to if you have one). The negative of the LED I then wired to the low oil pressure switch and the microswitch in parallel (the other connector of the low pressure switch and the microswitch both being connected to the chassis - earth). Thus, if either oil pressure dips below 35psi or the belt is thrown, the circuit is made to earth and the LED lights. Having been out in the car tonight, I can confirm the system works - a teething problem meant the LED came on as the microswitch was not quite adjusted right and thought the belt had come off - now sorted hopefully. Dave Link to comment Share on other sites More sharing options...
SimonMac Posted February 8, 2006 Share Posted February 8, 2006 Perfect Dave, much appreciated. Excellent instructions and parts list for someone technically challenged (ie. me!) *thumbup* Link to comment Share on other sites More sharing options...
david nelson Posted February 26, 2006 Share Posted February 26, 2006 Just gone to put the belt on and its to wide sz 5PK738 (58344) should it be 3PK763 or 3PK820 David SL #146 Link to comment Share on other sites More sharing options...
Dave McCulloch Posted February 26, 2006 Author Share Posted February 26, 2006 David It's definitely 3PK763 - and it is quite tight to fit. You need to rotate the engine with a socket on the crank pulley bolt, working the belt over the pulley edge as you turn the engine. Dave Link to comment Share on other sites More sharing options...
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