Ben Long Posted August 1, 2004 Share Posted August 1, 2004 When driving my R300, I appear to have a strange 'clonking/donking' noise coming from the rear suspension / drive shaft area. This mainly occurs when it is only me in the car, and seems to disappear when there is a passenger with me. It occurs when driving over speed bumps and general road bumps/pot holes and also appears to be more pronounced when driving round a L/H bend. I have checked some of the suspension bolts but need to get it on a ramp sometime this week to check it more thoroughly. Has anybody else come across this before, or have any suggestions as to what the cause may be? Please post a reply / email Cheers, Ben ben.long@vodafone.net Link to comment Share on other sites More sharing options...
Ben Long Posted August 2, 2004 Author Share Posted August 2, 2004 Boing Link to comment Share on other sites More sharing options...
Goochy Posted August 2, 2004 Share Posted August 2, 2004 Put the handbrake on, then rock the car back and forth using the rear wheel. This will show up any play in the radius arm and A frame bushes. Link to comment Share on other sites More sharing options...
Rob Walker Posted August 2, 2004 Share Posted August 2, 2004 Rear springs set with too much preload causing dampers to fully extend or worn rear brake pads, calipers hitting radius arms. Link to comment Share on other sites More sharing options...
Ben Long Posted August 2, 2004 Author Share Posted August 2, 2004 Goochy / Rob, Cheers for that. Makes sense actually, that the springs are set with too much pre-load. I assume that if I tighten these then it may help? Will also check the caliper to ensure it isn't hitting the radius arm Link to comment Share on other sites More sharing options...
Rob Walker Posted August 2, 2004 Share Posted August 2, 2004 Slacken them to reduce preload. Link to comment Share on other sites More sharing options...
Ben Long Posted September 6, 2004 Author Share Posted September 6, 2004 Found the noise at long last After going over the rear suspension, moving the gearbox across slightly and checking every conceivable bolt I could think of, it would appear that the cause of the knocking noise was the exhaust making contact with the chassis, just before it leaves the engine bay 😳 The pipe in question is the one closest to the gearbox and I have yet to think of a way of lifting this pipe so that it doesn't come into contact. Just off outside to have a look. Would recommend others with similar symptoms to check this out. Thanks for the advice though chaps. Could have been anything. Link to comment Share on other sites More sharing options...
Bafty Crastard Posted September 6, 2004 Share Posted September 6, 2004 Fit a washer(s) between the engine mount and the engine bracket, this will raise the engine in turn the exhaust pipe Caterhams solution ! worked for me R300 NUT'errrrrrrrr Edited by - Bafty Crastard on 6 Sep 2004 19:41:44 Link to comment Share on other sites More sharing options...
Frying Pan Posted September 6, 2004 Share Posted September 6, 2004 I'd check your engine mounts very carefully. Not unknown for these to fail It may just be the rubber mount that has relaxed slightly. Easy to check / replace if needed. Guy See some pictures of the build here. 4000 miles completed! Link to comment Share on other sites More sharing options...
Myles Posted September 6, 2004 Share Posted September 6, 2004 You might find a bit of mileage by relaxing the primary-to-head bolts and also those that hold the collector together - then persuade the can/exhaust into a slightly better position and retighten. There is a certain amount of leeway in the whole system. Keep BC free and open for ALL. Membership No. 43xx Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
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