Triumphrat

GrandPaulZ · 03-16-2010, 09:33 PM

I've been contracted by "Kev_England" to overhaul the bottom end of a 68 T120R Bonnie, so here is the project posting.

Engine as it arrived; the case bolts were all loosened, client had started to disassemble it and decided to send it in instead-

Gear cluster & cam pinions had already been removed and were in a seperate box-

Timed breather disc spring was walkabout-

I never like to see excess silicone sealer squeezed inside engine oil cavities, this engine had plenty of that-

jimmy bush · 03-17-2010, 12:39 AM

must be nice getting to work on an old engine that has already been cleaned.

GrandPaulZ · 03-17-2010, 11:34 AM

Yep, doesn't happen very often at all!

GrandPaulZ · 03-17-2010, 12:35 PM

At some point in time, the crank's main oilway got mostly plugged-

The engine was more or less cleaned, but still had some trash in it here and there-

A loose primary chain started eating into the oil collector, then broke most of it off; not a big deal, there's enough oil sling to still do the job-

Dang those loose primary chains!

I'm betting that what's left of the alternator stator mounting studs are sawed through to the point they need to be replaced...

GrandPaulZ · 03-17-2010, 12:41 PM

Stray silicone debris in the crank area, looking for trouble-

Crankcase sediment, not too bad, but I HATE the excess use of silicone-

Timed breather disc still happily in place-

More silicone trash in the tach drive cavity at the exhaust cam bushing, not good!

GrandPaulZ · 03-17-2010, 12:46 PM

Main oil seal was "folded" and must have been leaking quite a bit...

More damage from the loose primary chain, near the adjuster opening; not a technical issue-

Grunt in the tach drive-

GrandPaulZ · 03-17-2010, 12:53 PM

Drive sprocket knackered - "fishooked"-

Timing side exhaust cam bush was a loose fit in the case and had already started to spin. New bush will have to be oversized. Note the telltale spin scratch marks. Once it started to misalign, it also lost lubrication due to the lube hole no longer being aligned with it's supply (also note stray bits of silicone)-

El Grunt-o, but not nearly as bad as some I've seen!

Virtually new sump plug, with head already knackered-

GrandPaulZ · 03-17-2010, 01:00 PM

Finally down to the crank; the rods turned freely on the journals without any "flop"-

The primary nose of the crank is well and truly knackered, that's going to need some rehab-

Sludge trap was never opened since being peened shut at the factory-

Sludge accumulation at the mouth was about 30%, but increased to 50% at the bottom-

GrandPaulZ · 03-17-2010, 01:05 PM

This is the worst of it. Sludge accumulation had blocked off the rod journal oiling holes on the left journal, and the damage started. Thankfully, it wasn't too bad. I still can't figure out the wierd scratchings on the accummulation-

Right side oil holes were fine-

Pretty obvious difference, even with a blurry photo (sorry)-

"The remains of the day"; I couldn't get the bugger out without destroying it (my acetylene tank is empty, else I'm sure heat would have helped) I should have scraped out the tube, but you get the idea...

GrandPaulZ · 03-17-2010, 01:11 PM

Strange, but the left side shells look better than the right side! Still, they're already well into the sacrificial material-

The rods were in decent shape, a couple of very minor nicks here and there; obvious signs of overheating due to improper lubrication (thanks to the blocked journal oil holes)-

That's it for the tear-down. Now to put together the parts list and get the order in...