SE5A Project - Swindon

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gtcse8
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SE5A Project - Swindon

Post by gtcse8 » Sat Sep 21, 2019 5:58 pm

The Silent city. :lol:
OD is still available. :wink:
Indicator stalk, OR full unit ??. :?:
Rocking horse poo. :w
Enjoy your hols :D
Mark


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Post by Rev Light » Sun Sep 22, 2019 3:23 pm

Sorry, just need the stalk as it is the horn swicth that is kaput.


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Post by gtcse8 » Sun Sep 22, 2019 3:30 pm

I have a few dead units that the horn switch can be pulled off/repaired/replaced.
Hardest bit is the central wire for the contacts inside the knob at the end.


Mark Wilson. Garage sale everything must go. :cry: SE5a`s, GTC, SE6b`s, Triumph Daytona, Honda CB750 K7. Also on YouTube :wink: lookup RELIANT SCIMITAR V8 CONVERSION & billy no mates, Single Rat

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Post by Rev Light » Sun Oct 20, 2019 5:38 pm

So I have been slowly stripping my spare engine to take a look see what the 'funny noise' was that forced its removal from its previous home. The engine itself was, apparently a recent recon, with limited miles and good oil pressure. So I thought it might be worth the risk. Having removed the heads and pistons I was scratching my head to try and figure out what the issue might be. There was nothing obvious

The bores were, good, with cross hatching still visible, no discernable top lip and no scores.
The pistons were good, the big ends - barely any wear. The little ends - no discernable play.
Crank end float - minimum spec.

I spoke to Dave Peak at the Wiltshire Noggin this week, as he had heard the engine running with its issue. Dave seemed to recall that the 'knock' was not at crank speed , or even piston speed, so thought it might be timing?
Dave volunteered to come round today to take a look and check my sanity. Thanks Dave - its the first Essex I have stripped.

Having looked things over that I had already removed, we finally pulled the pulleys off so we could get to the timing wheel and look at the crank and cam. This is when we notice this nylon timing wheel. The crack in the nylon teeth that is clearly visible on the front of the wheel, is was almost all the way through to the back. The tooth to the left of the crack is mobile - slightly. This engine, was very close to a catastrophic failure.

This is the likely candidate for the 'noise' we think.

Why would you recondition an engine and leave one of these in place?

Cheers

Steve
Attachments
WP_20191020_10_14_38_Pro.jpg
10 minutes from total failure
WP_20191020_10_14_38_Pro.jpg (156.94 KiB) Viewed 1127 times


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Post by willholderogri » Sun Oct 20, 2019 6:11 pm

That will be the noise lucky escape I reckon


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SE5A Project - Swindon

Post by philhoward » Sun Oct 20, 2019 8:34 pm

The only reason I can think for not changing the gear is that for some reason, sone people don’t think the nylon gears are an issue.


I think you’ve just escaped a rebuild of much more than a few gaskets by the skin of your teeth (excuse the pun)..


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Post by reliant-reviver » Sun Oct 20, 2019 9:11 pm

Well to be fair they aren't an issue... up until the point where they fail :roll:

If you haven't got a replacement gear already I can assist with supplying an alloy one whilst I still have stock.


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Post by Roger Pennington » Sun Oct 20, 2019 9:26 pm

Wow, that certainly was a narrow escape! :shock: It should serve as a salutary warning to others.


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Post by Old and Slow » Sun Oct 20, 2019 9:45 pm

Very rare to get a picture of how the teeth are going to fail. Must be one in a million - I'd buy lottery ticket this week too!


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Post by Rev Light » Tue Oct 22, 2019 12:01 pm

Not sure if you can tell in the picture, although I did allude to it, but the nylon band, underneath tooth to the left of the crack, has come away from the metal subassembly. The failure mode, as far as I can see, is that the nylon band will come unstuck underneath the next tooth, etc. until there is enough 'flapping around to jam up and break off. At this point, the rest of the teeth are likely to be shredded as the valves and pistons lose sync and come to blows.........

Cheers

Steve


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Post by Rev Light » Sun Mar 01, 2020 8:58 pm

So it has been slow progress over the winter, but its still progress. Here are some pictures.

Thanks to Scimjim for his help and coffee.

Thanks to Dave Peak for his spare overdrive.

Thanks to Julian Hemper for selling me his 'duff' engine...

Should be running and driving by the end of the month......Shouldn't have said that now should I?

Steve Hawkins
Attachments
Engine, gearbox and overdrive ready to fit.jpg
Engine, gearbox and overdrive ready to fit.jpg (138.72 KiB) Viewed 266 times
gearbox and overdrive.jpg
gearbox and overdrive.jpg (138.6 KiB) Viewed 266 times
Engine.jpg
Engine.jpg (152.2 KiB) Viewed 266 times


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Post by willholderogri » Thu Mar 05, 2020 12:12 pm

looking good steve


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Post by Rev Light » Sat Mar 07, 2020 9:49 pm

It went in today. Lots still to do though.

Steve


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