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KiwiDave wrote:Reason for compression loss found Ian, more tomorrow. I'm told that 'borescope' is the correct term although boroscope is accepted.

struggling along with an android tablet and can't turn off the predictive shit.... I miss my Ultra book!

Just a quick edit:

The shot of the underside of the motor is in fact your new engine, not the old one. This was in my red RX2, so we had to swap the sumps and strainers over.

The oil strainers are "unsure" on the left (the smaller one) and RX2 on the right (the bigger one). The RX2 has a reverse bump sump, hence why we had to change it.

The oldschool "m" logo is on the longer through bolt, to help identify it. It is one of the 2 bolts that sits at the bottom, outside of the face of the rear plate.

Dave's old motor is completely apart.

Oh dear. Not paying attention in school

Keep up, Dave

So what was the cause of the demise, then?

Anyway ... moving on. The rear housing and rotor are good. Ok, so the housing is missing chrome here and there but, if you recall, the compression numbers made for very good reading. These later 12a's are very resiliant. Missing chrome doesn't necessarily equate to missing compression.


Rather nice flash bounce lighting effects here. Not intentional but still quite funky




So, no real surprises there then. The front is another world, all carnage and evil. It transpires that it is also, unfortunately, down to me and not an act of God. I spent a few days fooling about with pretty colored vac hoses and changed them around a few times (you may recall if you follow this thread). This necessitated the removal of the blue box several times and several times again.
At some point during this process, I mislaid the very small washer which goes with the retaining nut (wingnut no longer present). I was very careful with this washer, lest it should find it's way into places it should not venture. So. I was somewhat alarmed when said washer went awol and had a good look down thru the carb just in case ... and held my breath upon starting it up. And sigh of relief when it started ok.

A bit beat up here. Not all bad news though as a nice street port job will extend past the damaged area.


Something's taken out the edge of the apex seal


Something evil going on here That's rotor lightening but not in a good way




Evil stuff ... all mother of damage and toasted housing




The culprit! on the left outer edge




Can you tell what it is yet??


I knew what it was as soon as I saw it ...


The remains of the small washer from the air cleaner! I obviously didn't look hard enough. It must have sat in the secondary inlet until they opened sufficiently and then some sort of dark magic has occurred.


So boys and girls, the moral of the story is ... be fecking careful when you have the top of the carb exposed. If you suspect anything has gone down there, remove the carb completely and have a good look around. It may cost you an inlet manifold gasket but that's a small price to pay. Ask me how I know

Bloody hell Dave.... all this grief from a simple thing like that.... How much edge chrome flaking do you have on the good housing?

That's a bit horrid, dude I've blown up some motors but never yet managed to replicate the cover of Joy Division's Unknown Pleasures via the medium of housing scores What you've done there is you've mullered that. Really

Thanks for taking one for the team and demonstrating what can go wrong from the simplest bits of maintenance

Lucky wrote: What you've done there is you've mullered that. Really

Bugger! I thought it might polish out

Shame of it is that the housing would have been well re usable sans the horror flick artwork. Anyway, I have the housing and rotor in my little rotorcave. Plan is to get them cleaned up and then painted or chromed and put on display (well, in a few years after the hurt has gone).

Let's just say it was very well embedded in the housing and leave it at that. I had a hard time getting it back out.

One apex seal smashed to bits but still in it's slot. The others were missing the ends near the assist piece. Dave has the rotor. This rotor gave 0 comp on all 3 faces for a reason.

It'll look good on a shelf.

I have the good used 12A housing in my possession

That was very bad luck...

About 5+ years ago, my son went into my garage without my knowing. Removed huge tall KN filter,guess what and he dropped the big screw into the 51 IDA.
He put the the filter lid back and left as it..
I went in the garage later in the evening after work, spotted something odd about it in engine bay..the filter's lid was not set up my way of bolted on and found the screw missed.
My horror was that the engine was a PP motor, removed the lid and found the screw was rested on the butterfly.
Managed to removed it with a magnetic prong.
The trick was to stop the wee monkey removed the screw, taped over with strip of black tape over the screw.