Another timing issue doesnt make sense PLEASE HELP!!!
#1
Another timing issue doesnt make sense PLEASE HELP!!!
Im trying to do timing chains on my 98 Xj8 been messing with it for two weeks off and on and its not working PLEASE HELP!!! I am doing one side at a time i have the left head off and the right head is on. (just got done rebuilding bottom end) and its still hitting when I try to put it in time.
Heres what im doing is this right?
1. Put crank plug in ( yes its in the right hole)
2. Bring the flats of cams up and lock them in with cam tool.
3. Slide on vvt, eXhaust spocket and secondary chain. ( made sure that the vvt and eXhaust spocket were a half a tooth off from each other)
4. Put on straight guide and rotate eXhaust spocket ccw to take up slack on drive side of primary chain.
5. Put on curved guide and tensioner and put wedge inbetween.
6. Used timing chain tensioner tool and put ccw pressure on drive side of chains and tightened down eXhaust spocket and then the vvt unit.
Took all the tools off and turned it over by hand it turn over a little then hits. Its the back two valves hitting on the eXhaust cam hitting the very back piston.
It has the right cams in each head and theres no bent valves and nothing has falling in the cylinders that would cause it to hit. what could be the problem THANK YOU IN ADVANCE FOR ANY HELP
Heres what im doing is this right?
1. Put crank plug in ( yes its in the right hole)
2. Bring the flats of cams up and lock them in with cam tool.
3. Slide on vvt, eXhaust spocket and secondary chain. ( made sure that the vvt and eXhaust spocket were a half a tooth off from each other)
4. Put on straight guide and rotate eXhaust spocket ccw to take up slack on drive side of primary chain.
5. Put on curved guide and tensioner and put wedge inbetween.
6. Used timing chain tensioner tool and put ccw pressure on drive side of chains and tightened down eXhaust spocket and then the vvt unit.
Took all the tools off and turned it over by hand it turn over a little then hits. Its the back two valves hitting on the eXhaust cam hitting the very back piston.
It has the right cams in each head and theres no bent valves and nothing has falling in the cylinders that would cause it to hit. what could be the problem THANK YOU IN ADVANCE FOR ANY HELP
#2
Smitty:
Sorry to ask again, but I do not know - Can the ring gear assembly be put on the crank shaft out of phase? What parts besides the piston, rod and valves did you change? Other than these and what you mentioned, it is really hard to imagine what could screw up the timing. You do have the right length rod in that posiition, right?
Sorry to ask again, but I do not know - Can the ring gear assembly be put on the crank shaft out of phase? What parts besides the piston, rod and valves did you change? Other than these and what you mentioned, it is really hard to imagine what could screw up the timing. You do have the right length rod in that posiition, right?
#3
One other idea- could the cams be on the wrong side? (Bank A exhaust cam on Bank B head) Don't know if they are identical...
If the flats lined up, the only thing left is the triangle mark being in the wrong place on the crankshaft (Although I would expect more than just two valves would hit) OR The cam is pressing down the valves at the wrong time- thus my hypothesis.
If the flats lined up, the only thing left is the triangle mark being in the wrong place on the crankshaft (Although I would expect more than just two valves would hit) OR The cam is pressing down the valves at the wrong time- thus my hypothesis.
#4
#5
I thought the fleXplate only goes on one way. The cams are in the right sides of the head for sure. Theres no slack in the chains. I just put bearings in the bottom end and put a used crank and rods from the same year motor only differnence was my motor has steel liners and the motor I took the parts from was the nikasi liners (I dont think the rods were different I know the crank had the same numbers as mine) . Im out of ideas????
Last edited by smitty5534; 06-15-2011 at 02:36 PM.
#6
I assumed that your #3 reference to 'half a tooth off' was referring to the left/right bank primary chains on the crank. Is that true? That is how it should be.
Here is the JTIS primary chain alignment section:
https://www.jaguarforums.com/forum/j...prokets-54603/
Here is the JTIS primary chain alignment section:
https://www.jaguarforums.com/forum/j...prokets-54603/
#7
Ok smitty-
Are you SURE the flexplate stepped pin was in the crank when you alighned the plate? I do not remember what it looks like, but the literature indicates that is the alignment method for the drive plate. Check your crank position relative to TDC when the pin is lined up- TDC is not the alignment point, but either someone can post the offset, or I will compare mine, if you like.
Are you SURE the flexplate stepped pin was in the crank when you alighned the plate? I do not remember what it looks like, but the literature indicates that is the alignment method for the drive plate. Check your crank position relative to TDC when the pin is lined up- TDC is not the alignment point, but either someone can post the offset, or I will compare mine, if you like.
Last edited by sparkenzap; 06-15-2011 at 08:24 PM.
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#8
The half a tooth Im talking about relates to the vvt and the eXhaust spocket for the secondary timing chain I read that the vvt and the eXhaust spocket should be a 1/2 a tooth off is this correct? maybe I have this messed up? Also I thought the drive plate bolt pattern would only go on one way maybe theres more then one more does anyone know for sure? THANKS IN ADVANCE JEREMY
#11
As far as I can see in the literature, the flex plate lines up with a stepped locating pin. If you don't remember the pin, I bet that is your problem. Why not post a question for motorcarman or one of the other jagtechs with flexplate alignment in the subject.
#12
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sparkenzap (06-16-2011)
#13
#14
sparkenzap thanks for your input I will post something about the drive plate and see what they have to say about it
#16
Banks can fail too
Once you have the cylinder 1 at TDC, turn the crank another 45 degrees, then the oblong hole should be alinged. If the pin was gone as Sparkenzap mentioned (which enables you to place the flywheel wrong) it could be at least 45 degrees of, so you should be able to confirm if the flywheel is fitted correctly the to the crankshaft.
Once you have the cylinder 1 at TDC, turn the crank another 45 degrees, then the oblong hole should be alinged. If the pin was gone as Sparkenzap mentioned (which enables you to place the flywheel wrong) it could be at least 45 degrees of, so you should be able to confirm if the flywheel is fitted correctly the to the crankshaft.
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smitty5534 (06-16-2011)
#17
Ok I brought the number cylinder on Bank A all the way to TDc and turned the crank another 45 degrees and sure enough its off. The way I had it the number 2 cylinder on Bank A was at the top of cylinder and number 1 was half way down. Now I just have to figure out how to align the drive plate. THANKS SO MUcH for your guys help and ideas.
#18
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avos (06-17-2011),
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smitty5534 (06-16-2011),
sparkenzap (06-16-2011),
test point (06-16-2011)
#19
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smitty5534 (06-16-2011)