Hi;
I thought, due to its critical nature, I thought I'd post this particular question up outside of my project thread.
All if the questions revolve around the Primary Gear (or at least I think they do)
Today I have been going through the various containers of parts from my forthcoming engine build. Some of the parts have not been touched since I stripped the engine and I needed to find out which still needed cleaning / inspecting and which parts can go again or need replacing.
In amongst these parts (carefully packed away) was the Primary Gear.
I have inspected the Primary Gear and on the outside it looks fine (I am not a mechanic, nor an experienced Engine builder).
However on the inside there is some slight marking (looks a lot worse when zoomed in though).
Here is the Primary Gear:
And on the inside there are some visible rotation lines, the one towards the rear can be felt with a finger:
Questions:
Before we embark on the bushing I need advice on the following:
Flywheel / Primary Gear Compatibility (No of Teeth)
I bought a MED Engineering ST1 Verto Ultra Light Flywheel and Clutch Kit which meant I needed to change from an Inertia Starter Motor to a Pre Engaged Starter Motor. The reason for change was that the original Flywheel had a different amount of teeth than the MED Ultra Light one. The ultra light flywheel has 129 Teeth designed to marry up with a 9 Tooth Pre Engaged Starter. The Inertia Starter from the Metro Engine had 10 Teeth (can't remember how many teeth the original Metro one had).
Will this change in Flywheel now mean that the Primary Gear is no longer compatible - and what about the drop gearing (if that's what it's called)?
(whilst eating my dinner I was trying to picture how it all connects and the teeth on the flywheel are no where near the Primary Gear
However does it still make a difference?
Primary Gear Bushing
I have read this 3 year old post regarding Primary Gear bush damage, if the Primary Gear is compatible, in your expert opinion is this bushing OK or if not, can it be replaced? E.G. by fitting a new 'floating' bush?
Oil Inside the Wok
Not sure if this is an associated or separate issue, I recall that when I first stripped the engine to move it to my garage, when I removed the Wok, the inside was coated with blackened oil. I understand that oil in the clutch housing = major problems, but what would have caused this and what should I do to ensure the problem does not manifest itself during the rebuild.
Reading Kieth Calver's article on Primary Gear Problems here, a failed / failing bush / problem Primary Gear Bushing can cause oil to move through the primary gear, but I guess this will only leak into the transfer case and not into the Clutch Housing? So what's the probably cause of oil in the clutch housing?
Here's a pic from when I first stripped the engine, you can see the oil (the engine had not been run for about 15 years):
Help and advice needed on all of the above - thanks
Edited by JonnyAlpha, 12 April 2020 - 06:05 PM.