Broken Boffin

If you have a long-term project and would like to share/document progress, this is for you.

Moderators: scimjim, Roger Pennington, philhoward, Lukeyboy46, erikscimitardemon

Cartrain
RSSOC Member
Posts: 87
Joined: Tue May 05, 2020 12:17 pm

Broken Boffin

Post by Cartrain » Sun Aug 16, 2020 8:38 pm

Have you replaced or had the petrol tank out during your ownership ?

If not then I would recommend that you put it on your ‘must do’ list.

At the rear end of the chassis there are tubular sections at each side which connects to the outriggers and I note from one of your photos it looks exactly like mine before they collapsed due to severe corrosion.

Please get it checked out. Your car otherwise looks lovely, and congratulations on your perseverance.

Mick 4051



User avatar
ScimiTom
RSSOC Member
Posts: 695
Joined: Fri Feb 04, 2011 10:07 pm
Location: Houston, Scotland

Broken Boffin

Post by ScimiTom » Wed Sep 09, 2020 7:47 pm

The last couple of silicone hoses have finally arrived and Boffin's booked in for a full cooling system replacement (radiator, fan, hoses) next Tuesday. Any tips from anyone who's done this on their car? Pitfalls? Unforeseen issues?

At the same time, they're gonna try to set the timing and locate exactly where the timing mark should be - for some bizarre reason, there is absolutely no mark of any kind on mine! :shock:


Current: 'Boffin' (1971 SE5a)
Previous: 'Sunshine' (1980 SE6b)

User avatar
scimjim
RSSOC Member
Posts: 40772
Joined: Sun Oct 01, 2006 10:08 pm
Location: Gloucester

Broken Boffin

Post by scimjim » Wed Sep 09, 2020 7:52 pm

ScimiTom wrote:
Wed Sep 09, 2020 7:47 pm
The last couple of silicone hoses have finally arrived and Boffin's booked in for a full cooling system replacement (radiator, fan, hoses) next Tuesday. Any tips from anyone who's done this on their car? Pitfalls? Unforeseen issues?
Water pump? The third bolt can sieze, so plenty of plusgas beforehand. Also, silicone hoses often need re-tightening a few days after fitting.
ScimiTom wrote:
Wed Sep 09, 2020 7:47 pm
At the same time, they're gonna try to set the timing and locate exactly where the timing mark should be - for some bizarre reason, there is absolutely no mark of any kind on mine! :shock:
proper way is a DTI down number one spark plug hole and mark TDC on the crank pulley - or a tywrap down the bore and eyeball it :D


Jim King

SECURE DRY STORAGE FOR YOUR SCIMITAR

Current: SE5 (8Ball), 1400 1600 1800 Zetec ST170 powered SS1 (G97), 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, TI SS1 (snotty), 1600 SS1 (C686CCR).
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), 1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

User avatar
ScimiTom
RSSOC Member
Posts: 695
Joined: Fri Feb 04, 2011 10:07 pm
Location: Houston, Scotland

Broken Boffin

Post by ScimiTom » Wed Sep 09, 2020 9:09 pm

Thanks, Jim. And now, to translate for an ignoramus, please...? :oops:
DTI - 'dial test indicator'?
TDC - 'top dead centre'?
'tywrap down the bore and eyeball it' - 'feed a cable-tie into it and have a close look'!? What does that achieve? :?

I hadn't considered a new water pump. Damn... :|


Current: 'Boffin' (1971 SE5a)
Previous: 'Sunshine' (1980 SE6b)

User avatar
scimjim
RSSOC Member
Posts: 40772
Joined: Sun Oct 01, 2006 10:08 pm
Location: Gloucester

Broken Boffin

Post by scimjim » Wed Sep 09, 2020 10:05 pm

ScimiTom wrote:
Wed Sep 09, 2020 9:09 pm
Thanks, Jim. And now, to translate for an ignoramus, please...? :oops:
DTI - 'dial test indicator'?
TDC - 'top dead centre'?
'tywrap down the bore and eyeball it' - 'feed a cable-tie into it and have a close look'!? What does that achieve? :?

I hadn't considered a new water pump. Damn... :|
yes to DTI and TDC. There’s an area at the top of the stroke where the piston doesn’t move up or down as the crank/conrod go over-centre, finding the exact centre (TDC) is best done with a DTI. If you don’t have one, a big tywrap down the plug hole will move up and down with the piston. If you mark the point it stops moving and the point it starts again (by eyeball) the centre point is true TDC. In reality, unless you’re dialling in a cam on a high performance engine, it’s only a starting point for tuning, so doesn’t need to be dead on.


Jim King

SECURE DRY STORAGE FOR YOUR SCIMITAR

Current: SE5 (8Ball), 1400 1600 1800 Zetec ST170 powered SS1 (G97), 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, TI SS1 (snotty), 1600 SS1 (C686CCR).
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), 1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

User avatar
scimjim
RSSOC Member
Posts: 40772
Joined: Sun Oct 01, 2006 10:08 pm
Location: Gloucester

Broken Boffin

Post by scimjim » Wed Sep 09, 2020 10:06 pm

ScimiTom wrote:
Wed Sep 09, 2020 9:09 pm
I hadn't considered a new water pump. Damn...
sorry - but you did say full system (I stopped short at heater matrix :twisted: )


Jim King

SECURE DRY STORAGE FOR YOUR SCIMITAR

Current: SE5 (8Ball), 1400 1600 1800 Zetec ST170 powered SS1 (G97), 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, TI SS1 (snotty), 1600 SS1 (C686CCR).
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), 1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

User avatar
ScimiTom
RSSOC Member
Posts: 695
Joined: Fri Feb 04, 2011 10:07 pm
Location: Houston, Scotland

Broken Boffin

Post by ScimiTom » Wed Sep 09, 2020 10:22 pm

Thanks, Jim - that makes more sense to my rather simple brain now! Yes, I realised 'full system' might be inaccurate, which is why I qualified it with 'radiator, fan, hoses'. I think I'll leave the water pump though, and it's never had a heater matrix fitted. As a 'fair weather' car, I can live with that.


Current: 'Boffin' (1971 SE5a)
Previous: 'Sunshine' (1980 SE6b)

User avatar
ScimiTom
RSSOC Member
Posts: 695
Joined: Fri Feb 04, 2011 10:07 pm
Location: Houston, Scotland

Broken Boffin

Post by ScimiTom » Sat Sep 19, 2020 9:08 pm

The new bits are now fitted. A couple of relatively hot days have given me the perfect opportunity to check that the (surprisingly quiet) uprated fan is working as it should.

Using a depth gauge on the number 1 cylinder, TDC has now been set and clearly marked on the timing cover and pulley. It was pretty much spot-on already, but it's reassuring to now have a clear reference point!


Current: 'Boffin' (1971 SE5a)
Previous: 'Sunshine' (1980 SE6b)

Post Reply

Return to “Project Progress”