All:
Hi - Ive been trying to track down an intermittent scraping sound coming from the front left side of the truck for a few weeks. The scrapping sound only lasts for a second or two. Its not repeatable, but Ive noticed that it mostly happens when Im slowing down. Sometimes at 5, 10 or 20 mph. The sound doesnt speed up or slow down depending on the speed. It can happen in straight line or while turning. Happens more frequently in the morning when the engine is cold. I really thought it was the alternator bearing so I had that rebuilt (no luck). Then I was convinced it was the brakes. I did a complete brake job on all wheels and that didnt help. I checked the metal deflectors for rubbing on the rotors and could not detect any issue there.
Im wondering if its a collapsed bearing or something else in the drive belt or timing belt circuit. In the last year, I had an idler pulley fail so I replaced both of those and the drive belt tensioner. I plan on flushing the power steering system tonight. I also plan on checking the play in the suspension or bearings tonight. I did lube the pivot points in the suspension to attempt to eliminate a dry bushing or something with no luck. All links, ball joints, CV boots are intact... The sound is not a typical clunk or squeek. It really sounds like a bearing or metal on metal sound. Im tempted to dig into the timing belt even though I changed that 40k miles ago. If a bearing fails on that circuit that could be the end of the engine.....
Any ideas before I dig into the timing belt are appreciated.
TJ
Hi - Ive been trying to track down an intermittent scraping sound coming from the front left side of the truck for a few weeks. The scrapping sound only lasts for a second or two. Its not repeatable, but Ive noticed that it mostly happens when Im slowing down. Sometimes at 5, 10 or 20 mph. The sound doesnt speed up or slow down depending on the speed. It can happen in straight line or while turning. Happens more frequently in the morning when the engine is cold. I really thought it was the alternator bearing so I had that rebuilt (no luck). Then I was convinced it was the brakes. I did a complete brake job on all wheels and that didnt help. I checked the metal deflectors for rubbing on the rotors and could not detect any issue there.
Im wondering if its a collapsed bearing or something else in the drive belt or timing belt circuit. In the last year, I had an idler pulley fail so I replaced both of those and the drive belt tensioner. I plan on flushing the power steering system tonight. I also plan on checking the play in the suspension or bearings tonight. I did lube the pivot points in the suspension to attempt to eliminate a dry bushing or something with no luck. All links, ball joints, CV boots are intact... The sound is not a typical clunk or squeek. It really sounds like a bearing or metal on metal sound. Im tempted to dig into the timing belt even though I changed that 40k miles ago. If a bearing fails on that circuit that could be the end of the engine.....
Any ideas before I dig into the timing belt are appreciated.
TJ
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