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daver clasper
July 7, 2017, 5:15pm Report to Moderator
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Hi

Just bought a second hand AC fuel pump for Vitesse.  The thread that hold the top cover bolt/screw into the top alloy body are pretty non existent for about the first 5mm. There looks to be about 4mm of good thread below that.

I thought of using a longer bolt/Screw to pick up on the deeper, ok thread.

So a few questions please

Remove the trace/damaged thread with a small dremel grinding bit and the bolt/screw will pick up into the good thread?.

Run a tap down that will pick up into the good thead? (not much experience of taps/dyes).

Also, anyone know what size tap and bolt/screw I will need for that pump (later Vitesse Mk1 2 Litre).

Any help great please.

Thanks, Dave

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JohnD
July 7, 2017, 8:37pm Report to Moderator


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Any bolt should engage with at least 1.5 the bolt diameter's worth of thread. Especially in alloy, which should be a coarse thread.    
Is there enough 'meat' in the body to drill and tap for a larger size of bolt?

John


Serial Vitesse racer.

Old Blue.  1995-2001
Silverback. 2001-2007
SofS. 2007 - to date.

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nang
July 8, 2017, 3:33am Report to Moderator

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You could fill the hole with plastic metal, redrill and retap. Mates have had good results with this.
Tony.


If all else fails-Read the Instructions! ��Wairoa
New Zealand

1976 2500TC (converted to S spec) owned since 1998.

1999 BMW 2800 cc Z3 Convertible.
 
2003 BMW 525i Touring.
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Jonny-Jimbo
July 8, 2017, 8:32am Report to Moderator

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Or see if you can get a time-sert / helicoil for it - not sure on thread size though, sorry.


62 Vitesse 1600 - Slammed & modified
67 2000 - Fitted with 2.5 o/d - 2012 RBRR, 2015 Essex Rally, 2016 HCR, 2016 RBRR
67 2000 Estate - Dormant
70 Herald 13/60 - First car, many bits
77 CZ 125 Sport - 70 miles on the clock
77 Kawasaki KM90 - Shop hack
81 Yamaha DT125 - Many bits
88 Ginetta G4/4 - Dead
88 BMW E30 320i - For Sale
89 Citroen AX GT - Rally car!
90 BMW E30 318iS - Building to FIA spec
90 Mazda Eunos 1.6 - 'Popeye'
93 BMW 530i - Donor
95 BMW E34 540i - 4L V8
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piman
July 8, 2017, 11:39am Report to Moderator


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Hello Dave,

is the option there to drill straight through and use a nut and bolt?

Alec


Oswestry, Shropshire.

Mk1 1\2 P.I.,Jaguar Mk 2, very long term restoration. Jaguar X Type estate 2.5, Hymer 564 motorhome.
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Rallyspit
July 8, 2017, 2:31pm Report to Moderator
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Your other option is to send it back to the seller as unfit for purpose!
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poppyman
July 8, 2017, 5:29pm Report to Moderator
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if there are threads left at the bottom? take the pump to fasteners merchant.
ask for a bolt to fit it much longer than the old one. and get a nut to fit.
screw bolt in till it bottoms, cut off head of bolt then use the nut and a washer to tighten down
this has worked many times on various things. cheers
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RobPearce
July 9, 2017, 11:25am Report to Moderator

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This is the tin-top style pump, yes? As fitted on GT6 Mk3? Which, AFAIK, is not the correct part for a Mk1 Vitesse, although it's compatible.

Anyway, I had the same problem on my GT6 many years ago and did, indeed, fix it simply by fitting a longer bolt. I don't remember the thread details, though.


Current fleet
1967 Vitesse 2L conv "Tessa"
1970 Spitfire Mk3 (project) "Toby"
1972 GT6 Mk3
Not enough time or space
Recently sold:
1972 2.5 PI estate "Harry" (gone to russell on here)
1973 Toledo 2-door "Spike" (gone to a club official)
Used to have:
1968 Vitesse 2L saloon
1980 Dolomite 1500
1977 Dolomite 1850
1980 Dolomite Sprint
1982 TR7 DHC Sprint
1975 2500S saloon
1971 Herald 13/60 Estate (with 1500 Spit engine)
1975 Stag
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daver clasper
July 14, 2017, 5:58pm Report to Moderator
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Hi, and thanks.

Will try a longer bolt, as is only low torque to seal the rubber gasket I assume?.

Cheers, Dave
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daver clasper
July 14, 2017, 5:58pm Report to Moderator
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Posts Per Day: 0.27
Hi, and thanks.

Will try a longer bolt, as is only low torque to seal the rubber gasket I assume?.

Cheers, Dave
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poppyman
July 14, 2017, 10:11pm Report to Moderator
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Quoted from daver clasper
Hi, and thanks.

Will try a longer bolt, as is only low torque to seal the rubber gasket I assume?.

Cheers, Dave


cutting the head off the bolt and using a nut saves trying to find an exact size that could strip the few remaining threads.
very low torque, just use a spring or star washer when fitting plus the flat washer underneath
job should be sorted then

cheers, tony.
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Pete Lewis
July 15, 2017, 6:50pm Report to Moderator

Tssc Herts and Beds A.O.
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Its 1/4"unf    just had to this on a leaky stripped pump, there is a good depth to the
casting hole, , this one needed tapping   to get some reclaimed thread ,lower down the drilling

The idea of stud and nut is a good call  the nut  thread may need some sealer

pete


1964 1600 Vitesse 6 Cactus and Black , now  sold
now have T2000   Mk2 saloon in French Blue/grey trim  been  restored without running since 1997
now has power steering ,poly bushed and Alfa 156 seats
location  Luton
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daver clasper
August 15, 2017, 4:28pm Report to Moderator
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thanks for all your replies.

Have run a tap down it and seems ok.

there is some old oil/dry gunge in the chamber on the bottom half of F/P under the diaphragm, so removed diaphragm with it's stalk according to Haynes manual.  This has damaged the 2 fibre washers under the cup a bit, which I assume prevent engine oil entering this chamber.

No repair kits show these washers (also the diaphragm and valves seem good, so was hoping not to buy anyway) .

So, please.

Any ideas as an alternative to these washers?

How can I get the that wider flat end of spindle back through those washers safely anyway?.

Would a bit of oil splash back (as most of washers is there) into chamber be the end of the world anyway?.

Any help great please

Cheers, Dave        
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