Datsun Roadster Forum-311s.org

Id guess something on one of the sprockets but many here know more than i.
Since you have the oan off you can look at the lower chain and crank sprocket as you turn the engine over with a ratchet. You can look thru the upper inspection window to inspect the upper chain.
If it was my car tho, Id pull the timing cover so I could see the tensioners and jackshaft sprocket.
Dan


R

Sorry I just noted engine is already out. (I posted on your other thread)

Its hard to really inspect the lower chain very effectively unless you remove the front cover. I'd suggest you not rotate the engine- there is little to be gained. If you really want to do so, remove the spark plugs and all 8 rocker arms first, that way you can't bend a valve if the chain lets go while you are rotating it.

Remove the head, crank pulley, water pump and front cover to properly inspect.

It is a DIY job if you are a pretty decent mechanic.
Job #1 is don't do any additional damage. j

OMG! Very scary stuff. My inspection cover is still un-bolted ( waiting for a shim kit from Dean ), so I rushed out to the car with a high-intensity light & pivoted inspection mirror, to re-check the rollers on my upper chain & the under side of the "evil L" Roller surfaces still un-burnished and the nicks on the bottom of the L are only about 1/32" deep. No marking between the nicks. BTW, RE Gornal's posts & others replies, I also would not attempt to replace the chains without an engine pull. When my chains flew apart in 83', I pulled the engine myself, stripped it and sent the block to a machine shop to have it bored & refitted with new parts. I had the head decked as well, but only enough to get it optically flat ( I miked it on an optically flat granite block ). Even that was enough to give me a slack upper chain & a rattle on start-up after after sitting five years. Car has 25,574 miles on it since the rebuild.

Garry S.

I suggest you change all the gears and chains. Guides and tensioners as you can afford.
Like JT said, remove the plugs, un-adjust or remove the rocker and be careful not to "force" the engine to rotate.

Thanks All. JT do you have a list and price for the parts I will need? Happy to PM