Scimba - Just add fuel

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Crowther
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Re: Scimba - Hiatus

Post by Crowther » Wed Jul 05, 2017 9:15 pm

Thanks Roger. I now have a new set of partly-threaded bolts that match the originals for length - as you said, there are two lengths.
My next question is how clean does the engine block surface need to be?

Fear not - all ports and galleries were blocked when I was scraping the old gasket off...
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Re: Scimba - Hiatus

Post by scimjim » Wed Jul 05, 2017 9:19 pm

As clean as possible!

I use a dab of hylomar on the gasket at the 4 block/head joints.


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Re: Scimba - Hiatus

Post by Crowther » Wed Jul 05, 2017 9:24 pm

So cleaner than it is now! Carb cleaner and a plastic scraper got me this far. Are these the right tools?


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Re: Scimba - Hiatus

Post by scimjim » Wed Jul 05, 2017 11:07 pm

Yep. Once they're totally clean you can give the head surfaces a light rub with some wet & dry (800+ grit) wrapped around something perfectly flat, to make sure there are no high spots.


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Re: Scimba - Coming back

Post by Crowther » Thu Jul 13, 2017 9:01 pm

The inlet manifold is back on, torqued up as per the manual plus one pound foot for luck. Keeping the gasket in place was tricky and it has slipped a little at the back. Please tell me it looks OK?!
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Re: Scimba - Coming back

Post by scimjim » Thu Jul 13, 2017 9:03 pm

You need to trim it flush with a sharp blade so that the rocker box gaskets seal properly.


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Re: Scimba - Coming back

Post by Crowther » Fri Jul 14, 2017 7:19 pm

Thanks Jim, that makes sense. I've just noticed some more sticking out at the front! Does this job need doing again??
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Re: Scimba - Coming back

Post by scimjim » Fri Jul 14, 2017 8:04 pm

That looks normal.


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Re: Scimba - Coming back

Post by Crowther » Tue Jul 25, 2017 9:17 pm

The Scim is whole again but more unwell than ever! After refitting the distributor and all the gubbins it started after a lot of cranking though the timing was less than 8 BTDC. Adjusted to 14 with a strobe it ran reasonably well but I noticed the timing mark jumping about occasionally, two degrees or so. Then, within minutes, it started missing, the timing light showing an intermittent spark, missing more frequently before finally chugging to a stop. I'm completely out of ideas.
Last edited by Crowther on Tue Jul 25, 2017 9:19 pm, edited 1 time in total.


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Re: Scimba - Coming back

Post by scimjim » Tue Jul 25, 2017 9:18 pm

Dizzy problem?


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Re: Scimba - Coming back

Post by Crowther » Tue Jul 25, 2017 9:21 pm

Possibly. I've tried a different cap and rotor arm. The advance plate is earthed to the body with a braid. If you recall I had to abandon converting it back to points as either the dizzy shaft is slightly bent or the cam faces are worn.


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Scimba - Coming back

Post by Crowther » Wed Jul 26, 2017 8:55 pm

What the difference between 142536 and 142356?

2 cylinders.

What a berk.


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Scimba - Coming back

Post by scimjim » Wed Jul 26, 2017 8:57 pm

:-)


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

Crowther
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Scimba - Coming back

Post by Crowther » Sun Jul 30, 2017 6:11 pm

With the air filter back on the car was whole again, with one day to spare before Silverstone. Perhaps this year I would roll through those hallowed gates in style, not in my brother's Audi A3.

No.

The Scim still has a working radius of about 10 miles. Started like a modern, ran well when cold and was still going strong after the choke came off but after 20 minutes or so the misfiring began, the tacho dropping to zero for a few seconds at a time, and by the time I got home it was running on 2 or 3 cylinders, barely idling and the slightest throttle would kill it. I put the strobe on it and couldn't get a flash on any lead.

I think I'll take a couple of weeks off the Scim and come back to it with fresh eyes.


New and proud owner of "Scimba" ('72 SE5a).
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Scimba - Coming back

Post by Crowther » Sat Aug 05, 2017 10:54 pm

Time to get electrical.

I can't go back to points because the distributor cam is so worn but electronic ignition is letting me down. I'm thinking of getting a Pertronix unit at some point but it will need an ignition-controlled 12V supply, not the ballasted supply to the coil.

First, I'll try my ailing Powerspark on a "clean" 12V.

So, I want to take a supply from the fat white wire that feeds the 50A ignition control fuse. So, electrics gurus, what are my options, as a crimper, not a solderer? I've got various butt connectors and piggyback terminals for smaller gauge wire but the big white is giving me the fear...


New and proud owner of "Scimba" ('72 SE5a).
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