Author Topic: Need Comformation  (Read 346 times)

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T.O.M

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Need Comformation
« on: July 10, 2018, 05:48:10 PM »
HI
I'm thinking my dizzy is 180 degrees out and need to be sure before i try and fix it.Got my block and head back from the mini mechanics with the dizzy installed.{not the flywheel}
Can not start it.
After looking things up on the forum this is what i found.
1 - When my rotor is about 1 o'clock there are no timing marks visible through the hole on the flywheel housing.
2 -  looking at the rockers No 4 {clutch end of head} the spring closest to clutch end is compressed.

Is there anything else that would show that its 180 out ?
Does  the dizzy drive shaft have a off set.?
Any thing i have to be aware of while moving things 180?
By the way i would be totally lost and confused without this site.
Thanks in advance again. 

Terry

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Re: Need Comformation
« Reply #1 on: July 10, 2018, 10:39:01 PM »
Hi,

A1&2 - using the 'pointing at 1am' method is not the best way to check Top Dead Centre, it just tells you that something probably isn't right and if you are seeing #4 outside spring compressed means that you are on the compression stroke for #1 which suggests your firing on #1 is going to be more like at 10-11pm. 

It is not necessarily going to be 180 degrees out because the distributor drive slot is offset so it is going to depend on where the drive gear is in relation to the cam gear. Given the above I would say you are 1/4 out, or one tooth on the gears out.

To find out you follow the instructions in a post a couple of weeks ago about getting #4 valves 'rocking' or the exhaust just closing when the inlet is just opening. This tells you that the spark plug in #1 should be about to fire. Then look at the position of the rotor button and if it is not pointing somewhere between 12:30 and 3pm then your distributor is not aligned properly but that doesn't mean you can't start the engine.

Starting with the dizzy cap terminal closest to the rotor button put #1 lead on there and then going anti clockwise put on leads #3, #4, #2.

If you do want to get your distributor aligned so that #1 is approximately pointing in the right direction then you need to carefully remove the distributor, shake it as you withdraw it from the block so that it doesn't bring the distributor drive shaft with it. Then use the long bolt from the radiator mount, or a 5/16UNF of about 3-4" at least and thread it into the distributor drive shaft and use that to withdraw it and rotate it 1/4 of a turn or whatever you need and then place it back in and remove the bolt and replace the distributor and check the position of the rotor again.

The reason I say carefully remove the distributor and to use the 3-4" bolt is because if the distributor drive shaft is dislodged or dropped it is likely to fall into the gearbox and you have to separate the engine and gearbox to retrieve it.

Terry
Cujo. 1999 - 2016

T.O.M

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Re: Need Comformation
« Reply #2 on: July 14, 2018, 01:04:38 PM »
Thank you Terry.
Had my brain locked on something that was wrong.
So i finally did what any smart man would do i walked away from the problem for a couple of days.
So today i went back out to the shed got the instructions out of the bin walked around yard looking for my tools.Re read the instructions had another go at it.
Now I'm a happy little vegimite.Engine is up and running.
Was carefull pulling shaft out tied a piece of string on bolt incase if fell in.
On a side note engine keeped flooding and sometimes fuel leaking onto ground.
Was a very tiny piece of gasket interferring with the float valve (had to put my glasses on to see it.)

Can anyone recommend a s.u carby specialist i can take mine to for complete o/haul.etc.
Thank you again.

winabbey

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Re: Need Comformation
« Reply #3 on: July 14, 2018, 03:25:23 PM »
Thank you Terry.
Had my brain locked on something that was wrong.
So i finally did what any smart man would do i walked away from the problem for a couple of days.
So today i went back out to the shed got the instructions out of the bin walked around yard looking for my tools.Re read the instructions had another go at it.
Now I'm a happy little vegimite.Engine is up and running.
Was carefull pulling shaft out tied a piece of string on bolt incase if fell in.
On a side note engine keeped flooding and sometimes fuel leaking onto ground.
Was a very tiny piece of gasket interferring with the float valve (had to put my glasses on to see it.)

Can anyone recommend a s.u carby specialist i can take mine to for complete o/haul.etc.
Thank you again.

Where are you located? Assume you'd like something local?

T.O.M

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Re: Need Comformation
« Reply #4 on: July 14, 2018, 06:56:56 PM »
Sorry.
Werribee,Melb,Vic

winabbey

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Re: Need Comformation
« Reply #5 on: July 14, 2018, 08:43:23 PM »
Can anyone recommend a s.u carby specialist i can take mine to for complete o/haul.etc.
Thank you again.

I've seen several recent examples of David Walker's work on SU carbies and his attention to detail and results of his work are great. He's at Link Automotive in Mitcham. He's doing the twin HS4's from my ex-NSW Police Cooper S.

Terry

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Re: Need Comformation
« Reply #6 on: July 14, 2018, 09:42:14 PM »
Quote
Can anyone recommend a s.u carby specialist i can take mine to for complete o/haul.etc.
Is there something wrong with it or do you want it to look pretty and new?

Unless you are rebushing the butterfly shaft, overhauling or replacing the rest of the consumable parts is pretty straight forward and doesn't require any special tools. You can buy a whole kit or just the needle/seat, jet tube and matching mixture needle and do it yourself. 

Terry
Cujo. 1999 - 2016

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Re: Need Comformation
« Reply #7 on: July 15, 2018, 09:26:48 AM »
Hi
Over the last couple of years i have replaced the butterfly,butterfly shaft{both badly worn} etc which did improve things.
Pulled this photo from an old post of mine which shows the old and new butterflys the old one having tabs worn onto it.

The shaft is a bit loose on the bowl side and when revving and it backfires fuel vapor is blasted through it.I think the bearings/bushes are worn.When i accelerate it really feels like it starved of fuel and hesitates and backfires sometimes.
I don't have access to reamers etc anymore to replace the bushes.
I think i would also like to replace the needle and spring {a mine field for me when i read up on them}
With a few other little things missing like the accelerator attachment is an unbrako with lock nut and washers,springs missing of idle screw springs.Thought i would get a price on an o/haul.Just drop off wait for phone call and bolt back on.Tired of standing there looking at the carby thinking something is wrong.
After the amount i have spent on the moke thought might as well do this.Pick it up,bolt it on, set it,forget about it and move on to thinking about disc brakes maybe.
Spring is coming fast and i plan to get lots of miles on the clock this year to finally enjoy it.
Thanks Winabbey for that.
Looked up on the google and noticed a place call Wilsons in Airport West anyone had work done with them?
Thanks
 

Terry

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Re: Need Comformation
« Reply #8 on: July 15, 2018, 08:24:55 PM »
Hi,

if the engine is back firing, hesitating and driving sluggishly then it sounds like it needs to be tuned and/or the incorrect mixture needle is fitted. I have carby's with a lot of play in the shaft and they drive okay and don't cause any of the problems you are describing.

I haven't used Wilson for about 30 years, but they have been around for a very long time and they did have a good reputation but I haven't heard anything either way in recent times.

Terry
Cujo. 1999 - 2016