A few questions

[sogood]

​So, a few questions that hopefully, the learned folk on here can help me with. 1st picture shows a small cylindrical device down behind the distributor. Can anyone tell me what it is? Second picture shows a black wire with an eye on the end, which emerges from the loom and I'm assuming it's a stray earth/ground of sorts. Any thoughts? Can I just connect it to any convenient earth point? Likewise, a stray wire at the transom, this time green, which comes out of a plastic tube along with some other wires, except that this one doesn't go anywhere! Thoughts?

​The next picture is of a "plug" of sorts, down below the coil. It's one of a few that I've noticed around the top of the block. What's it for? And on the distributor cap there is a threaded hole, just to the right of the fixing screw hole. There's nothing in it or nearby. What's it there for and if it's unused, is it worth sealing it up to prevent water ingress. The distributor cap is being replaced, it's just in case the replacement has this same hole also. I also want to replace the rotor and find it to be a tight fit. Does it just pull straight up and off? FWIW the coil and plugs leads/plugs are also being replaced. I'm surprised that the engine ran as smoothly as it did, given the amount of crud and corrosion on the leads connectors/terminals.

And finally, where, if anywhere does the crankcase vent go to. Mine has a short black plastic hose that just runs off towards the front of the engine. Thanks in advance for any input.

 

[sogood]

Apologies for the multiple posts. Don't know how I did that! Oops!

 

[QBhoy]

Hi
Pretty sure the cylinder looking object is your ignition coil ? Hard to tell, but there should be a ht lead attached to it, then going to the distributer. The green wire looks like an earthing wire (perhaps corrosion orientated)

 

[sogood]

That is the ignition coil, with the HT lead removed for clarity. It was the square headed plug in that picture that I was enquiring about. Sorry, pics got a bit mixed up. Thanks for the response.

 

[Bondo]

1st picture shows a small cylindrical device down behind the distributor. Can anyone tell me what it is? Second picture shows a black wire with an eye on the end, which emerges from the loom and I'm assuming it's a stray earth/ground of sorts. Any thoughts? Can I just connect it to any convenient earth point? Likewise, a stray wire at the transom, this time green, which comes out of a plastic tube along with some other wires, except that this one doesn't go anywhere! Thoughts?

​The next picture is of a "plug" of sorts, down below the coil. It's one of a few that I've noticed around the top of the block. What's it for? And on the distributor cap there is a threaded hole, just to the right of the fixing screw hole. There's nothing in it or nearby.

Ayuh,.... The "cylindrical device" is the oil pressure sender,....

Black wire is an unsed ground,.... there could be a body groundin' screw in the bottom of the distributor body, which screws in from below, over the intake manifold,...
Gotta pull the distributor,..

Green wire should be a bondin' wire, like an earth plane connection wire,... hull fuel tank, fuel fill, any metal in the water,...

The hole in the distributor cap should have a small brass elbow screwed in it,...
Nothin' hooked to it, just a brass elbow,....
It provides ventin', without the fire hazard,... sparks can't jump around a metal lined angle,... explosion proof,...

 

[sogood]

Thank you bondo. As usual, a font of knowledge. Any thoughts on the square plug I mentioned? Is it maybe a freeze plug? And does the vent on the rocker go nowhere in particular? Many thanks again.

 

[Bondo]

Ayuh,.... The square plug is a pipe plug in the coolin' water passage,...

 

[sogood]

Thanks for that. So my next question is, what does it do, as in, what's it for? Flushing, draining? Thanks.

 

[Bondo]

Ayuh,.... In yer case,... Nothin',.... Leave it alone,....

If you wished to have a domestic water heater, or a cabin heater,....
That would become the Hot water port,....
Water is returned to the plug that looks like that one, only in the circulatin' water pump's body,....