Essex v6 help needed.
Discussion
Hello, Im currently rebuilding a Hensen M30 kitcar running an essex v6.
The problem now, its not running on all cylinders on the left bank. (exhaust is only warm not hot like the other side and it clearly sounds like its misfiring and doesnt change when i pull the leads off that side.)
so far ive ported and polished the intake manifold, fitted a brand new weber 38 dgms carb with a k+n, new spark plugs, new leads, cleaned out but not replaced the dizzy, adjusted the rockers cos it was tappety, and done all the usuall service items.
I will do a compression test and see what that says, and could do with setting up timing accuratly.
Has anybody got any ideas what might be going on? Or have any info on timing these?
Also if anybody knows a good mechanic that has in depth knowlege of these engines around Edinburgh or east scotland it would be appreciated. Thanks.
The problem now, its not running on all cylinders on the left bank. (exhaust is only warm not hot like the other side and it clearly sounds like its misfiring and doesnt change when i pull the leads off that side.)
so far ive ported and polished the intake manifold, fitted a brand new weber 38 dgms carb with a k+n, new spark plugs, new leads, cleaned out but not replaced the dizzy, adjusted the rockers cos it was tappety, and done all the usuall service items.
I will do a compression test and see what that says, and could do with setting up timing accuratly.
Has anybody got any ideas what might be going on? Or have any info on timing these?
Also if anybody knows a good mechanic that has in depth knowlege of these engines around Edinburgh or east scotland it would be appreciated. Thanks.
For it just to be miss firing on one bank (all 3 cyclinders???), I would doubt it would be the ignition timing- or it would be missing/spluttering on all 6.
Like has been suggested, check over the basics first.
Do you have the firing order in correct sequence?
Also, you could pull off the dizzy & check the inside of the cap for carbon build up & cracking- this could be the cause of your miss-fire.
Pull the plugs out & have a look, black, white or wet?
Check the points are gapped correctly (sorry, don't know the value)
Check condition of HT leads- try swapping them over with the other bank (obviously keeping the firing order correct)
When I pulled the heads off my essex, found the rear cyclinders were running lean (which I believe is common on those engines, due to the manifold design).
But have not heard of 1 complete bank not firing, its not a complex engine, so it must be very simple to cure.
If you get no joy in here, I suggest putting it in the Scimitar, TVR & Ford forums
Like has been suggested, check over the basics first.
Do you have the firing order in correct sequence?
Also, you could pull off the dizzy & check the inside of the cap for carbon build up & cracking- this could be the cause of your miss-fire.
Pull the plugs out & have a look, black, white or wet?
Check the points are gapped correctly (sorry, don't know the value)
Check condition of HT leads- try swapping them over with the other bank (obviously keeping the firing order correct)
When I pulled the heads off my essex, found the rear cyclinders were running lean (which I believe is common on those engines, due to the manifold design).
But have not heard of 1 complete bank not firing, its not a complex engine, so it must be very simple to cure.
If you get no joy in here, I suggest putting it in the Scimitar, TVR & Ford forums
Edited by ol' dirty on Monday 25th August 22:23
If my memory serves me correctly isn't the DGAS the one with the geared throttles, two idle mixture screws etc?
That being the case it is effectively two carbs in one body. If one half of the carb were running very weak those three cylinders would not want to know about firing and the exhaust would not heat up.
Any good?
That being the case it is effectively two carbs in one body. If one half of the carb were running very weak those three cylinders would not want to know about firing and the exhaust would not heat up.
Any good?
Ribol said:
If my memory serves me correctly isn't the DGAS the one with the geared throttles, two idle mixture screws etc?
That being the case it is effectively two carbs in one body. If one half of the carb were running very weak those three cylinders would not want to know about firing and the exhaust would not heat up.
Any good?
Yes it is but I think the manifold makes the carb barrels feed both banks at once, i.e. the outers on one side and the centre on the other.That being the case it is effectively two carbs in one body. If one half of the carb were running very weak those three cylinders would not want to know about firing and the exhaust would not heat up.
Any good?
Ribol said:
If my memory serves me correctly isn't the DGAS the one with the geared throttles, two idle mixture screws etc?
That being the case it is effectively two carbs in one body. If one half of the carb were running very weak those three cylinders would not want to know about firing and the exhaust would not heat up.
Any good?
The 38DGAS, according to the manual, does feed each bank separately via & dual inlet design. so this could be your problem then?That being the case it is effectively two carbs in one body. If one half of the carb were running very weak those three cylinders would not want to know about firing and the exhaust would not heat up.
Any good?
Each barel has separate idling & main system but is fed from a common float chamber. HTH
Edited by ol' dirty on Monday 25th August 22:53
Thanks for all the input guys. Will check over all suggested items today. Im hoping it will be something stupid like me getting the leads the wrong way round. Theyre new leads so they shouldnt be the problem. Carb also brand new so should be semi set up to run out the box i guess. plugs are a bit black. Dizzy looks ok and i cleaned the arm and stud bits when building. no water in the oil so hoping its not the headgasket. Think i ought to try and find a granada haynes manual or something that covers these engines and has the technical info (firing order, gaps, timing etc) ill pop up a couple pics later cos i know we all love pics 
If you don't think it's the carb, then pull the rotor arm off the shaft & check the cam lobes for wear- i.e checking that the points open on each of the 6 lobes.
ETA, plugs could be black due to over fuelling or a weak spark, what are the other banks like?
ETA, plugs could be black due to over fuelling or a weak spark, what are the other banks like?
Edited by ol' dirty on Tuesday 26th August 09:55
ol' dirty said:
If you don't think it's the carb, then pull the rotor arm off the shaft & check the cam lobes for wear- i.e checking that the points open on each of the 6 lobes.
Even if there is wear on the distributor shaft isn't it highly unlikely the wear will happen to be on all three cylinders on that bank only? Gassing Station | General Gassing | Top of Page | What's New | My Stuff