Thread: Busted dizzy drive gear

Good evening,

Managed to get an excellent fast response on another question I had regarding timing cover identification.

I have acquired an offroad buggy in which has a 3.9 rover.

Now, my next issue I'm having.
I have broken two dizzy drive gears, both on the end of the dizzy and the one on the end of the cam shaft.
From what I have search it is due to lack of lubrication, which oil pressure could be a contributing factor? Or lack of I should I say..?

Was ment to leave to go away wheelin last Friday at 2.30am, Thursday night at 1.30am was reassembling the front of the engine in a rush after finding the stripped dizzy gears.
I'm hoping that when we slapped it together just happened to put the dizzy gear on the cam shaft back to front? But that doesn't explain the first time it happened?

The new gear from Thursday night last <8 hours driving, low revs it seems to be ok, but soon as there's higher revs used (faster speed apposed to crawling) it starts to miss and carrying on..the start of the gear stripping.
When I pulled the engine down yesterday it was exactly what I thought it was, but I also noticed this? Have I assembled something wrong?


This is a new engine from when I original bought the buggy due to putting the oil pump back on without a gasket.. Oops. And to be honest I've almost had enough of the rover engine but would be much more convinient if I could get it running adequately.

I have bought a new oil pressure gauge to try to get a proper reading on the pressure, All new gaskets on the front to hopefully maybe seal things up a little better.
But just trying to gather any ideas for when I'm reassembling it on the weekend.

Thanks,
Ethan.

There is a right way and a wrong way to assemble the drive gear on the front of the cam. The oil for lubricating the chain and dissy gear travels down the extra deep keyway of the cam spacer from a hole leading from the front cam journal.



The dissy drive gear has a groove in it that allows oil to get sprayed around and the centre section is slightly raised leaving a small clearance between the spacer and the outer side of the groove, which faces rearwards.



In the picture the gear and the bolt need flipped over to go on the spacer.