#226
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I would rate it about an "8." It's not what I would consider an easy job. Warranty time to replace the upper chains and tensioner fit is around 4 hours. The first time I did one on my 06 Pathfinder, it took about 8 hours, but I did not have the ring stopper tool and I also replaced the radiator. Because I didn't have the ring gear stopper, I had to remove the upper plenum and valve cover gaskets. Now, keep in mind I'm a former Nissan tech, had a fully equipped shop with lifts and air tools at my disposal. A lot of time is wasted cleaning the RTV sealant off of the parts. Instead of the 3M ThreeBond sealant mentioned in the TSB, I recommend Permatex Ultra Grey Rigid High Torque sealant in a caulk tube to be used with a caulking gun. You are going to be laying down a lot of sealant in the front cover and this makes it a lot easier! Also, if you are doing more than is stated in the TSB, such as replacing the water pump, thermostat and other parts like guides and tensioners, it will add more time to the job.
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#227
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Hello, I'm working on this job right now on my 2007 Xterra and badly need some help.
I replaced the secondary chains and plastic guides, and the primary chain. I put it all back together then tried to start the engine and it wouldn't start. I assumed the timing was off so I took it all apart again. I think the passenger side exhaust cam is off by a tooth or two. When properly aligning this cam, where is a reference on the engine where it should line? If none, should the key-notch be parallel to the intake cam's marking? Thank you for the help |
#228
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( for the secondary chains) |
#229
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( for the secondary chains) Look at post #1 it has some very good pictures that should help you. |
#230
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#231
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Please, I BADLY need help with this project. I have a 2007 Xterra.
In short: I replaced the secondary tensioner shoes/guides ala the bulletin, put everything back together and had no start. Pulled everything off again and readjusted the timing, put everything back together and still no start. Long version: when I was putting the primary chain back on the engine, the passenger side cam gears were one link counter-clockwise off the primary chain markings. I attempted to nudge the cams clockwise a small amount but one of the valves must have been closing and knocked the cams far forward. NOTE: the secondary chain has been on this whole time. So, not knowing at the time, I put a wrench on the intake cam and turned them counter-clockwise back to line up the timing marks. Afterwards, everything looked lined up and I proceeded to put the engine back together. When the engine didn't start I assumed the timing was off and tore everything apart again. Unsure what the cause was, I had a friend come over and we tried figuring this out. We talked to a mechanic friend who said the problem was that I turned the cams counter-clockwise which messed with the VVT. He said to offset the crank from TDC and rotate the cams clockwise until the timing is back at TDC which should kind of "reset" the VVT in the cams (again, intake and exhaust cams still connected). So my friend and I rotated both side cams one time (360 degrees) back to TDC and then put the crank back at TDC (had to go counter-clockwise so no pistons struck the valves) and proceeded to line everything back up. We turned the the engine by hand and it seemed nice and smooth. However, once again, the engine won't start. Is there something we did wrong? Is the timing still off somehow? Or could it be an unrelated problem like spark plugs or fuel line? Thank you for all the help! |
#232
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#233
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1. I am assuming you've consulted the Engine Mechanical manual with regard to the project at hand and you followed procedures.
2. When you rotated the crankshaft 360 it does not mean completing the 360 your back at TDC. You may have to go around one more time. You cannot know that by simply rotating 360. So do this: Remove the #1 cylinder spark plug. Get a straight stick wood or metal that will fit into the plug hole and lower it until it reach the piston. Be sure its long enough so that when piston hits bottom you still can see the top of it. Have someone rotate the crank while you watch the stick go up and down. You can practice doing this until you feel confident enough knowing when piston hits bottom and reaching TDC. Check the alignment of the chain and make adjustment. good luck. |
#234
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Thank you for the reply. Are these the connections on the drivers side of the timing cover? If so, I believe I never took those off, but I will check and make sure.
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#235
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I do understand that two rotations are needed for a complete cycle. What I did prior to manually roatating the cams was set everything at TDC for reference, then I turned everything 90 degrees from TDC so that no pistons were up while I rotated the cams. Once the cams were at TDC I roatated the crankshaft (without the primary chain on) backwards 90 degrees to TDC again, and then I put the primary chain back on. Going back to my original post, was rotating the cams backwards what messed things up? If so, I only rotated the cams one revolution in the correct direction to TDC when I took everything apart the second time to try again. Should I have gone around a few times to reset the VVT in the cams? Or is one enough? Also, I noticed the OP's crank at TDC was slightly to the right of the factory mark on the engine. I know he set TDC off the fan bracket/faux-water pump--is that the correct spot for TDC, or is it the mark on the inside of the timing case? Thank you again for the help! Last edited by bender-offender; 03-01-2017 at 05:43 PM. |
#236
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Once you set #1 cylinder at TDC, you said you rotated the crank and cam 90 degrees so no piston were up. Is that covered in the manual. If I remember correctly, once #1 is set at TDC you are not to rotate the crankshaft or cam or it will alter the orientation. Just redo again and compare the position of cam as described in the manual.
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#237
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Thank you, Benny. I will try this again.
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#238
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I wonder if the plastic guides wear out into tiny pieces and get removed by oil filter or large chunks that end up in oil pan partially blocking oil intake.
Dropping the oil pan to check doesn't seem very fun. |
#239
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BTW, for those eligible.
https://topclassactions.com/lawsuit-...ction-lawsuit/ |
#240
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Need some advice please...
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Tags |
chain, fyi or diy, repair, tensioner, timing, vq40, whine |
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