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help! replacing the timing chain on my 82 720 4x4.


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#21 wayno

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Posted 01 January 2018 - 04:16 PM

Put the cam gear back on the cam, using the bolt, if you have to push the cam from the back forward again and turn the cam till it lines up with the dowel pin, you might have to turn the crank a little if it is at TDC so the valves don't hit the piston, if it is not at TDC then you are fine.

Once the cam is connected back up again you can use the cam gear/chain to hold the crank still to get that bolt off the front pulley.


 

 


#22 datzenmike

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Posted 01 January 2018 - 05:47 PM

I'm guessing the tensioner is making this difficult.


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#23 wayno

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Posted 01 January 2018 - 05:51 PM

Then pull the oil pan and stick a 2X4 in the crank.


 

 


#24 captain720

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Posted 01 January 2018 - 05:54 PM

Used an impact and got that off. The dowel was in the cam gear and the cam gear was off. So I put the dowel back in the correct hole and put the dowel back in the cam in the right spot. (After removing the old tensioner) all the timing parts look brand new though so I am thinking I will just replace the tensioner. (Is that socially acceptable?).

1986 and 0 Nissan 720 kc with a 1984 Z24 (third engines the charm?) http://community.rat...y-first-pickup/
1986 and 0 Nissan 720 kc 2wd http://community.ratsun.net/topic/71766-one-wasnt-enough/

 

 

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#25 captain720

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Posted 01 January 2018 - 09:12 PM

So I am just going to replace the tension-er and reassemble it. I never took the chain off so it was in the right spot and I put the cam gear back in the right hole. I then verified that the timing was correct (I did not change it as the gears and the chain were still on the same teeth) I had someone slowly  turn the motor and I put a screwdriver down the spark plug hole so that I could verify that the piston was in fact at TDC, and at that time the valves were closed.


1986 and 0 Nissan 720 kc with a 1984 Z24 (third engines the charm?) http://community.rat...y-first-pickup/
1986 and 0 Nissan 720 kc 2wd http://community.ratsun.net/topic/71766-one-wasnt-enough/

 

 

Datsun=Project


#26 captain720

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Posted 02 January 2018 - 10:49 AM

I decided to put the new chain and stuff on, but the new chain has no marks on it? Aren't they supposed to have marks on them like a special colored link or something?

1986 and 0 Nissan 720 kc with a 1984 Z24 (third engines the charm?) http://community.rat...y-first-pickup/
1986 and 0 Nissan 720 kc 2wd http://community.ratsun.net/topic/71766-one-wasnt-enough/

 

 

Datsun=Project


#27 captain720

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Posted 02 January 2018 - 11:37 AM

Apparently this timing chain manufacturer sells unmarked chains? Which that is kind of stupid if you ask me but whatever. So I marked the new chain with the same marks and I can't get either chain to line up I have the valves closed and the 1st piston at TDC and the timing marks are no where near lining up. No matter what I do I can not make the timing marks on the chain match the marks on the sprockets. Are they just not supposed to match? It seems like if I put the chain on it shouldn't matter where it is positioned as long as the sprockets are in the right spot.

1986 and 0 Nissan 720 kc with a 1984 Z24 (third engines the charm?) http://community.rat...y-first-pickup/
1986 and 0 Nissan 720 kc 2wd http://community.ratsun.net/topic/71766-one-wasnt-enough/

 

 

Datsun=Project


#28 banzai510(hainz)

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Posted 02 January 2018 - 11:38 AM

watch my vid.?

The cheaper kits are mostly taiwan made chains and dont have the brite links

 

TDC the block and head.

then if old chain has the links you can put them side by side and ink pen mark the new chain


Throw on some Weber sidedrafts, Rising Sun hood.... call it good

#29 captain720

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Posted 02 January 2018 - 11:39 AM

watch my vid.?
The cheaper kits are mostly taiwan made chains and dont have the brite links

TDC the block and head.
then if old chain has the links you can put them side by side and ink pen mark the new chain


Yes I put ink on the new chain to match the links on the old chain. The block and head are at TDC.

1986 and 0 Nissan 720 kc with a 1984 Z24 (third engines the charm?) http://community.rat...y-first-pickup/
1986 and 0 Nissan 720 kc 2wd http://community.ratsun.net/topic/71766-one-wasnt-enough/

 

 

Datsun=Project


#30 captain720

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Posted 02 January 2018 - 03:29 PM

Finally figured that out, but when I was putting the timing guide back in the bolt broke so I have been working on that since 12:30. :(

1986 and 0 Nissan 720 kc with a 1984 Z24 (third engines the charm?) http://community.rat...y-first-pickup/
1986 and 0 Nissan 720 kc 2wd http://community.ratsun.net/topic/71766-one-wasnt-enough/

 

 

Datsun=Project


#31 captain720

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Posted 02 January 2018 - 04:56 PM

One screw extractor broke, the other didn't work, and the third one removed the broken bolt! So now I have all the new timing parts in and it looks amazing!

1986 and 0 Nissan 720 kc with a 1984 Z24 (third engines the charm?) http://community.rat...y-first-pickup/
1986 and 0 Nissan 720 kc 2wd http://community.ratsun.net/topic/71766-one-wasnt-enough/

 

 

Datsun=Project


#32 bottomwatcher

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Posted 02 January 2018 - 05:56 PM

You've got some fortitude captain! I always enjoy reading others efforts and it helps ease the pain that this shit doesn't only happen to me. Keep it up and it is always interesting to watch a team effort (although it is your knuckles) such as this have a happy ending.

#33 captain720

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Posted 02 January 2018 - 08:26 PM



You've got some fortitude captain! I always enjoy reading others efforts and it helps ease the pain that this shit doesn't only happen to me. Keep it up and it is always interesting to watch a team effort (although it is your knuckles) such as this have a happy ending.

Thanks man! Really appreciate the encouragement.

 

Timing chain tensioner was pretty far gone. The guides had pretty good grooves in them too and the chain appeared to have stretched significantly.

IMG_20180102_194134117.jpg

New parts look pretty good if you ask me. Got the new tensioner squished all the way in like the picture in the FSM and managed to get the chain put in the right way, after several tries. ;)

IMG_20180102_165736995.jpg

Does this thing go on this way?

IMG_20180102_171623274.jpg

Or this way?

IMG_20180102_171630044.jpg

The picture in the book is not clear to me, but if I stare at it long enough it starts to show whatever I want. :rofl:


1986 and 0 Nissan 720 kc with a 1984 Z24 (third engines the charm?) http://community.rat...y-first-pickup/
1986 and 0 Nissan 720 kc 2wd http://community.ratsun.net/topic/71766-one-wasnt-enough/

 

 

Datsun=Project


#34 datzenmike

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Posted 02 January 2018 - 08:59 PM

IMG_20180102_171623274.jpg


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#35 captain720

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Posted 02 January 2018 - 09:17 PM

Thanks.


1986 and 0 Nissan 720 kc with a 1984 Z24 (third engines the charm?) http://community.rat...y-first-pickup/
1986 and 0 Nissan 720 kc 2wd http://community.ratsun.net/topic/71766-one-wasnt-enough/

 

 

Datsun=Project