Oaksey's XJ6

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Oaksey
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Oaksey's XJ6

Post by Oaksey » Tue May 24, 2016 9:43 pm

I wasn't going to start a thread on this as it's a foreigner here, but I'm already after a bit of advice :lol:

I collected this on Saturday
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So it's a 1971 Series 1 XJ6. Unfortunately it's only a 2.8 but it is manual overdrive and I bought it for its condition. It's only done 22,000 miles from new, it is all original apart from a respray and a different diff ratio and it has buckets of history, including the original bill of sale and tax disc. It's in amazing condition, zero rust, original underseal etc. The interior is brilliant too, just needs some leather feed.
Image

Of course, there's problems with it. The temperature sensor is faulty, the clock doesn't work and an exhaust mount is perished but the biggest issue is it's tickover. It ran nicely on the way home and averaged 30mpg while doing 75-80 the whole way (on those private roads obviously) but it's tickover was very high. I adjusted the idle and now it dies whenever the revs fall to idle Ie when you come to a junction. When you Rev it and let it go to idle, the revs fall very low then pickup and hunt a bit. I then took the dash pots off to check the mixtures and the needle guides were set extremely rich. I adjusted them to standard but the idle is still up and down and it'll die when you dip the clutch on approach to a junction. It's also quite hesitant when pulling away but once you're underway, it really likes to accelerate.
I'm not quite sure where to look. The car is also equipped with AED (auto enrichment device) which is almost like another little carb for when the engines cold. These are prone to giving problems but usually making the engine use too much fuel rather than actual running problems.

Are there any SU experts out there?


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Re: Oaksey's XJ6

Post by CNHSS1 » Tue May 24, 2016 9:50 pm

Now thats lovely! 8)


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Re: Oaksey's XJ6

Post by scimjim » Tue May 24, 2016 9:56 pm

Nice :-)

Check for air leaks first then apply the mantra "most fuel problems are ignition related and vice-versa" :-)


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Re: Oaksey's XJ6

Post by Lukeyboy46 » Tue May 24, 2016 9:58 pm

That is lovely...

It sounds like an air leak to me?

Edit - beaten by Jim!


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Re: Oaksey's XJ6

Post by Oaksey » Tue May 24, 2016 10:00 pm

Yep, checked for air leaks and the only part under suspicion was the elbow for the dizzy vacuum pipe. I replaced it with the one off JHR and it's exactly the same :(


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Re: Oaksey's XJ6

Post by scimjim » Tue May 24, 2016 10:04 pm

Does the dashpot oil feel alright? Some people use engine oil.


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Re: Oaksey's XJ6

Post by philynnbob » Tue May 24, 2016 10:13 pm

That really is a lovely looking motor!



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Re: Oaksey's XJ6

Post by Roger Pennington » Tue May 24, 2016 10:15 pm

Nice-looking car! :D

The limit of my SU carb knowledge is that it's important to have the right oil in the dashpots?


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Re: Oaksey's XJ6

Post by greeny » Tue May 24, 2016 10:36 pm

You little git!!! One of my favorite cars!!!!
That is lovely!!!!!!


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Re: Oaksey's XJ6

Post by littlestwoo » Tue May 24, 2016 10:38 pm

Edd China sets up some SU's on a Volvo in a recent new Wheeler Dealers,shows an interesting trick to set correct mixture. Would agree best to be totally sure ignition is sorted then move onto carb setup. SU's can leak air around the butterfly spindles and obviously the manifold gaskets.


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Re: Oaksey's XJ6

Post by efi_sprintgte » Tue May 24, 2016 10:42 pm

Dashpot oil being correct improves throttle response, low dashpot oil leans out when under load. Tick over issues are normally the jet in the base (on HS models) getting stuck (it gets bent..) or the piston in the dashpot being scoured.


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Re: Oaksey's XJ6

Post by Oaksey » Tue May 24, 2016 11:15 pm

Cheers all.
There was very little oil in the dashpots so I put some in and it seemed to make no difference.

I might just take them off and apart as the previous owner had them rebuilt so perhaps the job wasn't very well done


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2015, 2016 and 2017 SSSC Champion
1974 Yellow Se5a Overdrive
1971 Blue Jaguar XJ6
1966 Blue Coupe Straight Six
Previous- Coupe S6,
SS1 Ti, E90 SS1 Ti, SE6a x3, SE5 Auto, SS1 CVH, Mk2 Sabre, Rebel Estate

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Re: Oaksey's XJ6

Post by 1949bug » Wed May 25, 2016 7:24 am

Oaksey wrote:Yep, checked for air leaks and the only part under suspicion was the elbow for the dizzy vacuum pipe. I replaced it with the one off JHR and it's exactly the same :(
Lovley car, if the carb messes you around you could always strap a supercharger on like the draguar in 'Roadkill' 8)

Seriously low mileage car there, good investment!



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Re: Oaksey's XJ6

Post by ronnie » Wed May 25, 2016 7:50 am

Look at that interior- fabulous
I can smell the leather
The colour suits it.

What diff ratio does it now have?
4.55 ratio from a 2.8 manual is rare



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Re: Oaksey's XJ6

Post by RonH » Wed May 25, 2016 7:55 am

Oaksey wrote:Cheers all.
There was very little oil in the dashpots so I put some in and it seemed to make no difference.

I might just take them off and apart as the previous owner had them rebuilt so perhaps the job wasn't very well done
My E Type service manual states SAE 20 engine oil. It also has a section on SU carbs I can drop it off tonight if you want a look.



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