Trouble fitting an MSD 8383! Stops about 1/4 from seating!


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By Whitey - 14 Years Ago
Hello All,

Firstly, thankyou all for replying to my previous post regarding advance curves for the dizzy for an old ski boat.  

Well the dizzy arrived from the the states to here in Australia (thankyou Atlantic Speed, you were great and happily plug you guys! Saved $200 plus change.) and now it's time to fit it.  I see in theory it is a simple drop in and plug up the new leads and away you go, however Murphy's law has struck and I'm having troubles.

The dizzy just won't drop in completely (stops at the O ring) and I'm buggered if I know why.  Before removing my old 57 dizzy I turned the motor to the rotor was at #8, marked it on the intake and slid her out and marked again on the intake where the rotor stopped to assist in lining up the helical gear for installation.  When I drop the msd in I line up the rotor at the finishing mark, little wriggle and it turns to nearly the starting point (helical gear lining up) but the dizzy is just under a 1/4 inch up from seating correctly (can just see the o ring).  I thought possibly the oil pump shaft has turned a little and holding her up so I removed the msd, dropped in old faithful and she seats correctly.

I tried again with the msd to the same conclusion even gave a gentle tap on the frame, thinking the new o ring is tight but will not drop that 1/4".  I took her back out and even turned the oil pump shaft a little but still can't make her seat, and am now at a lose as to why as again old faithful will drop straight in.

Also the vacuum advance tube hits against the intake manifold (ECZ-B 4 barrel) when I try to turn the dizzy to line up #8 with the rotor.  I don't really need the vacuum advance for ski boat use but can it be removed to assist in adjusting the dizzy or just cut off the tube and plug the hole but that won't give me much more adjustment?

I have ECG-S heads fitted and it comes so close to the head bolt that also is a worry.  I had a temp sender in the way which I had to plug with a brass plug and relocate but that was and easy fix.

Any help is greatly appreciated as it's really annoying having it but not being able to use it! 

Cheers Whitey

By Whitey - 14 Years Ago
Gents, please forget about my question re the vacuum advance canister hitting the intake manifold.  My stupidity didn't let me see that I just have to move the leads one or two positions around and that fixes that problem!!  Some things are that simple that are just overlooked. 

Still can't get her to drop that last 1/4".  I'm going to measure the shaft lengths between the two dizzy's and also the width of the oil drive shaft to confirm it will fit into the female end on the dizzy shaft, just to rule things out.

Cheers Whitey

By Whitey - 14 Years Ago
Well, it's in! Woohoo!  Looks like the spline wasn't quite lining up with the oil pump shaft and after a little more adjusting she dropped straight in.  I hate how you can play with it for a couple of hours and then all of a sudden in she goes!

My only worry is that the rotor and the finishing mark on the intake manifold isn't quite right and the msd goes a little further on (about another 4-5 degrees).  I tried taking it out and feeling for the next cog either way but when slid back in it ended up miles off in either direction so I stayed with the original marks and will see how she goes tomorrow. 

Murphy lurked again, and the new leads I measured off the old ones aren't quite right and 2 are a smidge too short so off to the auto shop tomorrow to replace and hopefully kick her over.

Cheers Whitey

By Fordy Guy - 14 Years Ago
Whitey, did you check the gear on the new dizzy by counting the teeth?
By Fordy Guy - 14 Years Ago
woops, looks like you got it, never mind.
By LON - 14 Years Ago
Whitey ,

Just received your PM .Yes ,those dizzzies can be very trying sometimes .I had the same problem with the canister .After I finally got my dizzy in ,I pulled it out 4 more times and that son of a gun just fell in every time  I went to install it . ??? It refused to drop in for the previous half hour .Bumping the starter was the secret .It just fell in .

Lon

By Ted - 14 Years Ago

Whitey.  Sounds like you’re there but try this in the future.  Using a wrench to rock the crankshaft via the damper bolt in either direction will allow the distributor to fall in place easier.  It is the oil drive that must be aligned before the distributor can be fully seated.  Although the engine can be bumped over with the starter to accomplish this, the engine will need to be rotated through two turns to get the cylinder that’s being timed back to its original location.

By Whitey - 14 Years Ago
Thanks for the replies guys, after I get another couple of leads this morning to replace the short ones I can't wait to turn her over and with 3 weeks holidays now, I'm going SKIING with Y block Power!

Cheers Whitey