How do you Inspect chain rails
I want to take my car a 02' 2.7 on a 600 mile RT,.but I want to inspect the chain rails,and install new tensioners before I go,once the cams are locked can I just remove valve covers and take a peek ?? Thanks Frank
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I can't answer your question but my understanding is that there is an important difference between 3 chain engines and 5 chain engines... so best to mention what year your car is...
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Thanks elgyqc,..I just updated ! its a 02' 2.7
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What`s the mileage of the car? The side rails are pretty sturdy, at least in my 5-chain engine I just reused them after 100k miles because they were totally fine. What makes you think they might have to be replaced?
If you pull out the scavanging pumps you can look down on the rails using a mirror or a borescope, at least on my engine, which again, is a 5-chain. And it`s on a stand in my garage so there`s plenty of room, which may be different when the engine is in the car. To see the inner surface of the rails of course you would need to remove the tensioners (locking the camshafts too) so you can pull the chain off the rail using a wire or similar. I`m not 100% sure, but I think this inspection is doable without pulling the valve covers off. |
I have about 88K on it, and its just the chain noise at start up. I intend to change the tensioner's ,labor day weekend, along with some 20W50 oil, I think the tensioners bleed off real quick in the constant 108 deg's of the summer
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oh plus my cam deviation #'s are 3.5 and 8.2 so i thought maybe the rails are worn down,
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Ah, that makes sense. It`s then a good idea to pull the cover off and see what`s going on. I don`t know the 3-chain engines but probably the smallest chain pad is the weakest point which is in the cam cover anyway.
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Iam a 5 chain..but before I pull cover,..Iam going to change the tensioners and go with a little heavier oil,..if that noise goes away I ll feel good,..if not...then off comes the covers..Or I will pull the engine and rework some stuff...I would love to rebuild a 3.2 and throw it in there ! but not sure I want to spend that much yet ! Thanks Frank
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At 8.2 it’s pretty clear that the chain pads need changing. Just the uppers in a 5 chain. I’ve only done this with my engine on a stand. Apparently it’s doable with the motor in the car but I don’t have the patience to lie on my back craning my neck for hours. Cool if you have a lift!
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Hmm do you mean the green cam cover plug or a different type of plug.Thanks !!
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well I am sure its not the cam cover plug, But Iam not very Familiar with these engines ,.But I will look it up Thanks
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:) Yes, it is the green plug, on the pump side, now it`s unplugged:
http://986forum.com/forums/uploads02...1598497390.jpg You can`t see both, but you can see the upper one that usually breaks, as Newart says. It`s the orange plastic thing deep inside on the right. If it`s in a really bad shape, it`s enough to tell by taking a peek through the hole. With a borescope you can see more. http://986forum.com/forums/uploads02...1598497419.jpg |
Ahh.Great thank you very much that really helps out,..! I now have a clu..lol. Frank
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That only gives you a partial peek at two of the eight chain pads, you cannot even see the four large ones, or the two short ones on the short chain:
http://rennlist.com/forums/attachmen...adjuster-5.jpg |
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Could I pull the spark plug tubes and then use a bore scope to get a good look..??
and would a Bore scope that connects to your phone work,.?? Thanks Frank |
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http://986forum.com/forums/uploads02...1598802167.jpg For reference, here is a picture for the size of the camera I used for inspecting the actuators, it`s a cheap Depstech camera from Amazon and it works with a smartphone. http://986forum.com/forums/uploads02...1598802043.jpg And yes, this is only good for inspecting one of the small chain pads, the upper one, but this is the most likely to fail out of all the pads. For inspecting the long side rails I would lock the camshafts and crankshaft, pull the tensioners (to free up the rails) and the scavanging pumps and look into there with a camera. Wear is not likely on these at this mileage, but if one is broken at the pivots probably you will see it. My bet is you`ll find the small pads worn down, did you see yellowish or brown plastic debris in the oil filter? |
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