[peterwm08]

I just finished rebuilding the 4.6 outta my 98 a few days ago. it turned over great without any noises the day I set the timing. Now after sitting for about half a week fully assembled ready to go in, I decide to try and turn it by hand and it feels as if the crank is hitting some resistance and then it releases with a double clank and I can turn further, it makes this sound about 2-3 times per rotation. Can anybody offer me any clue as to what possibly happened, im very frusterated as I was about to put it in this upcoming weekend.

Thank you for any and all suggestions!!

 

[massacre]

Is your timing cover installed? Are you turning clockwise?
if the tensioners don't have oil pressure you can get some chain clank on the cover

 

[peterwm08]

Is your timing cover installed? Are you turning clockwise?

hello, i just took the time to take the valve covers and timing cover back off to see what is possibly going on, im turning clockwise, somehow both chains jumped 4 teeth, luckily the motor is still in time, and it turns over smooth as butter no clank with the timing cover and valve cover off, im completely puzzled

 

[massacre]

4 teeth sounds like a lot.
need to know more about what has been done to this engine.
did you line up all of the marks and links on the timing chains?

 

[massacre]

The chain tensioners need to be extended

 

[peterwm08]

4 teeth sounds like a lot.
need to know more about what has been done to this engine.
did you line up all of the marks and links on the timing chains?

I did a full rebuild after purchasing and getting rod knock in less than a week, I lined up the marks on the timing chain with the correct marks on the cams and crank sprocket with the #1 piston at tdc, I took the pin out of both tensioners already

 

[peterwm08]

Do i need oil pressure for the tensioners to do their job 100%??

 

[massacre]

Are you using stock parts? Jumping 4 teeth is a big deal. which sprocket is jumping teeth?
are you using the thick or thin trigger wheel?

 

[massacre]

Do i need oil pressure for the tensioners to do their job 100%??

100%? yes
but it should still turn over by hand without problems

 

[peterwm08]

Im using the stock cam sprockets but duralast crank sprockets that came with my timing kit as they had a bit less play than the ones with 210k miles, aswell as duralast tensioner which im sure is just outsourced chinese crap i suppose, i believe i have the thick trigger wheel

 

[peterwm08]

I probably turned it over maybe 2-3 possibly 4 full rotations to verify where i was hearing the clunk, in just those few turns it somehow jumped the 4 teeth on both crank sprockets and both cam sprockets, im totally lost

 

[peterwm08]

I also had the harmonic balancer already installed when it was making the clank

 

[massacre]

oh wait
you are not using a degree wheel.
the modular chains do not return to the marks on the sprockets every revolution

 

[massacre]

is this engine on a stand?

 

[peterwm08]

no its definitely jumped, i turned it over 4-7 times once i had the cover off, and at no point did the original marks line up, so i lined up all the timing marks and on all 4 sprockets all are off by 4, also yes it is on a stand at this time

 

[massacre]

That is what i am telling you. Line up the links and the marks when setting initial cam timing (you really should degree the cams) but those links and marks will not line up after rotating the engine. They will eventually line up again eventually, i forget how many rotations it takes to make them line back up again.
So just because the links and marks are not lining up after 4 rotations does not mean that your engine jumped time

 

[peterwm08]

My bad i thought it was 2 full rotations for the chains to line up with the marks again

 

[massacre]

I think it's more than that

 

[massacre]

Can you isolate the clunk? Do you think it's the cam covers or the timing cover?

 

[peterwm08]

i believe its the timing cover, clank sounded like it was coming from the crank sprocket area, very obviously a metal on metal