Help! Timing chain gear

[converted_to_datsun]

I need advice... Swapped my head to a closed chamber head and having trouble getting the timing chain gear back on. What's the trick?

 

And I watched Haynes video but he did the whole timing chain kit...

[wayno]

Did you use a timing chain block to hold the tensioner in place?

If you didn't, your going to have to pull the front off now. :crying:

[ggzilla]

There's no trick. If it's the 620 engine and you held the chain up (like every repair manual explains) and loosen the Tensioner it will go right back on.

 

Many Datsun engines do not need the chain held up, but many/most OHC chains do.

[ariascarlos1990]

Your 1 hour job just turned into a 4 hour job. have fun!

[converted_to_datsun]

I used a timing chain block... The chain didn't slip. Just can't get the gear on. What do you mean loosen the tensioner?

[banzai510(hainz)]

try turning the cam slightly to induce slack to one side and retry putting the cam sprocket back on.

usually turn cam clockwise.

 

 

if you put a closed chamber on just to increase compression you waisted your time and risked a NON running truck. If it was working already I would have advised not to to this.

[datzenmike]

I've had tight ones before. I put the chain on the sprocket and lined the cam dowel pin up. Held the sprocket up and got the bolt started. As it tightened, it pulled up on the chain and the sprocket slipped on. I had to force it slightly but not too much.

[converted_to_datsun]

Yep motor was running fine but condition was kinda unknown since I've never had the head off and I found a peanut head so I swapped it yesterday. Everything went smoothe except the timing chain soo far

 

This one is really tight. I've tried rotating the cam but no luck yet.

 

If a link even half dropped that might be the problem... Looking into doing the whole front cover.

Gonna try one more thing before I order the gaskets tho

[converted_to_datsun]

Got the only in the cam! Now just need to get the dowel to line up... It's harder than I thought. Now that I thing about It the chain was tight when I took it off to begin with

 

I hope to have it back together soon

[DanielC]

This is what you are fighting against.

It should be more like this.

If you look close, in the second picture, the black "shoe", just above the crankshaft sprocket is pushed into the block with the two bolts a littler farther. You want to get that "shoe" farther into the block.

 

The camshaft will not turn easily, because four of the valves are not seated, and they are putting pressure on the camshaft. one or more valves may also be on the flank, or side of a can lobe, halfway open, and trying to turn the camshaft, probably in the direction you do not want it to go.

 

If the camshaft sprocket is on the cam, but the dowel does not line up, I would first try grabbing the center of the camshaft with a pair of pliers between the #2 and #3 exhaust valve lobes and try to turn the camshaft in the direction you need it to go. If you cannot turn the camshaft, try loosening the valve adjustment under the rocker arms, that are under a lobe on the camshaft.

 

If you can keep a lot of tension on the camshaft drive chain, by turning the crankshaft backwards, (counterclockwise) you might be able to get the tensioner to go back into the block. IF YOU DO NOT KEEP THE TENSION ON THE CHAIN, THE TENSIONER WILL COME OUT DOING THIS. You might gain a little by rocking the crankshaft back and forth a little, but you must keep tension on the chain.

[converted_to_datsun]

I got the tensioner to give me some slack using a combination of most of the advice I've gotten. It's all lined up and torqued to spec!

 

Thanks guys I'd be lost without ratsun... And now I can help a buddy solve the exact same issue later this week thanks to ratsun!

[banzai510(hainz)]

since your a expert now buy this all 3

http://www.amazon.com/Alltrade-648831-Nissan-Timing-Holding/dp/B0002Q8TV4/ref=sr_1_1?ie=UTF8&qid=1353360921&sr=8-1&keywords=datsun+timing+chain+tool

[converted_to_datsun]

I used that exact timing chain block. I borrowed it from eagle Adam. It worked really well I think my chain was just a tight one

[banzai510(hainz)]

I had bought 10 of them.

I gave most away already

[datsunaholic]

I have the actual Nissan one.