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The tensioner is there to maintain proper tension on the timing belt. The timing belt controls valve timing. If the tensioner is unable to properly maintain tension on the belt, the valves will open early or late which can cause misfire. Eventually the tensioner will either seize or break, which will probably cause the timing belt to break or jump teeth. This can cause engine damage on interference engines (engines with no clearance between valves and pistons). The engine in your picture looks like a Toyota 3.4L, which is not an interference engine. However, the marks on the belt (L-CAM and R-CAM) are supposed to be lined up with the marks on the cam sprockets… maybe the belt has already jumped teeth?
looks like yes it has jumped. a couple of teeth. spark plugs looks ok. does that mean, damage could be smaller?
You would probably be ok with just replacing the timing belt and tensioner, and use some brake cleaner to clean off all the red dust while you’re at it.
I don’t know if this is an issue or not, but the stencils on the belt are upside down/backwards. You’d think the belt should be installed so that things are legible from the mechanic’s point of view, and CAM-L would be the left side cam as the mechanic sees things when installing the belt.
Having the belt the wrong way around may have contributed to the belt jumping 5 or so teeth, especially if the engagement side of the teeth are different from the exit side. I doubt they are, but maybe the belt should be turned around anyway.
[quote=”Evil-i” post=141572]I don’t know if this is an issue or not, but the stencils on the belt are upside down/backwards. You’d think the belt should be installed so that things are legible from the mechanic’s point of view, and CAM-L would be the left side cam as the mechanic sees things when installing the belt.
Having the belt the wrong way around may have contributed to the belt jumping 5 or so teeth, especially if the engagement side of the teeth are different from the exit side. I doubt they are, but maybe the belt should be turned around anyway.[/quote]
Not an issue. The left bank is the one on the driver’s side, which is correctly oriented in the photo. The direction of the writing on the belt is not very important, but the direction the motor rotates is. The belt is on properly, although jumped.
The biggest issue, is, I don’t think the picture is the OPs engine. The engine in the photo is a V6, but the photo of the plugs and the compression test are for four cylinders.
[quote=”cap269″ post=141573][quote=”Evil-i” post=141572]I don’t know if this is an issue or not, but the stencils on the belt are upside down/backwards. You’d think the belt should be installed so that things are legible from the mechanic’s point of view, and CAM-L would be the left side cam as the mechanic sees things when installing the belt.
Having the belt the wrong way around may have contributed to the belt jumping 5 or so teeth, especially if the engagement side of the teeth are different from the exit side. I doubt they are, but maybe the belt should be turned around anyway.[/quote]
Not an issue. The left bank is the one on the driver’s side, which is correctly oriented in the photo. The direction of the writing on the belt is not very important, but the direction the motor rotates is. The belt is on properly, although jumped.
The biggest issue, is, I don’t think the picture is the OPs engine. The engine in the photo is a V6, but the photo of the plugs and the compression test are for four cylinders.[/quote]
Yep, this whole thing is confusing. OP did agree that his timing belt had jumped some teeth, so I made the assumption it’s a photo of his engine. Also, this is a SOHC engine, which would make it the 3.0L engine, wouldn’t it? As far as I know, the 3.4L is DOHC.
I skimmed through the thread again, and if the OP mentioned the year, make and model of vehicle and engine type, I’ve missed it.
[quote=”Evil-i” post=141578]Yep, this whole thing is confusing. OP did agree that his timing belt had jumped some teeth, so I made the assumption it’s a photo of his engine. Also, this is a SOHC engine, which would make it the 3.0L engine, wouldn’t it? As far as I know, the 3.4L is DOHC.[/quote]
The engine in the photo looks like a 5VZ 3.4L Toyota to me. It has two cams, but the second is gear-driven off of the first under the valve cover, hence only one cam sprocket.I skimmed through the thread again, and if the OP mentioned the year, make and model of vehicle and engine type, I’ve missed it.
You didn’t miss it. It wasn’t mentioned.
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