Engine has rattle on belt side replaced belt and tensioner but still there.when i take some tension off belt it goes away.dont here it in park,just when i trn on lights or a.c. or in drive. also goes away when driving or raising idle with accelerator
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Check the belt idler for bad bearing (common problem),and or the chain tensioner with a stethescope, the auto repair will try and sell you a new timming chain, the tensioner can be replaced from the out side of the engine
Make a simple drawing of the routing of the belt. or try to take a digital picture for reference on installation. Typically, one side of the belt has groves, and the other smooth. The pulleys will be grooved or smooth to match the side of the belt they are supposed to contact, don't put the grooved side of the belt on a smooth pulley or vise versa.
There should be an "idler pulley" which applies pressure to the belt to keep it tight. This idler maybe manual or automatic. A manual pulley will usually have an adjustment bolt running perpendicular to the pulley face. You will loosen the bolt in the middle of the pulley a bit, then loosen the adjustment bolt until there is enough slack in the belt to remove it from at least one pulley, the the whole belt should be easy enough to remove, barring any engine mounts in the way. If an automatic (Sprung) tensioner is used there is usually a way to get a 3/8" or 1/2" drive breaker bar onto the pulley and actually "flex" it so that the belt tension is relieved. You will need to hold pressure on the tensioner until the belt is removed from a pulley, this may take another set of hands. Installation is the reverse of removal. Old automatic tensioners can sometimes get stiff, may need to be replaced, or removed and lubricated until it actuates smoothly.
Check all the pulleys very carefully to insure the belt is aligned properly, before starting the engine. many a belt has been destroyed when someone started the engine with belt misaligned. Have fun.
Release tension on the belt. Remove the belt from the pulley, remove the belt tensioner, install new belt tensioned w/lock-tite on mounting bolt, and torquing bolt to specified measurement. Reinstall belt and viola.
not likely possibly the cover for torque converter may be loose. if rattling coming from pass. side may be belt tensioner/or water pump. to check shut engine off remove serp. belt check water pump pulley for play by wiggling back an forth do same with belt tensioner. check trans fluid level while on level surface engine warm&running tranny in park. some gm cars have had problems with crank shaft pulleys making rattling noise also.