how to find TDC on a 1.0 hijet

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how to find TDC on a 1.0 hijet

Post by Ryan 95 on Tue Jan 20, 2015 1:22 pm

hi, bought a 2nd hijet that needs the distributor set right, but cant find the top dead center as theirs no timing marks, anybody know how to find it?
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Re: how to find TDC on a 1.0 hijet

Post by PFM on Tue Jan 20, 2015 7:07 pm

I guess the answer you're not looking for is 'try the middle of the roof'! Very Happy Sorry don't know, but I bet HJ does.

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Re: how to find TDC on a 1.0 hijet

Post by Ryan 95 on Tue Jan 20, 2015 7:44 pm

Lol kind of not relevant now as we sorted it Very Happy
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Re: how to find TDC on a 1.0 hijet

Post by HighlyJetted on Tue Jan 20, 2015 11:07 pm

On the bell housing there is a rubber bung near the throttle body.

Turn it round, there are 2 marks you can see on the flywheel.

You need a timing light to sort a 993cc hijet.

Most I work on have been timed up wrong.
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Re: how to find TDC on a 1.0 hijet

Post by Ryan 95 on Tue Jan 20, 2015 11:10 pm

Cheers, seen that mark but thought their should of been a 2nd alignment mark on the gear box, will try again tomorrow
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Re: how to find TDC on a 1.0 hijet

Post by HighlyJetted on Wed Jan 21, 2015 8:24 am

There is no mark on the gearbox, there is a little folded metal pointer that is bolted to the end of the crank case, directly below the hole.

It is very hard to get the timing light in there as the bulk head bar is in the way.
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Re: how to find TDC on a 1.0 hijet

Post by Ryan 95 on Wed Jan 21, 2015 8:15 pm

we can actually get the timing light in and have got the timing set, but still wont run, cranks and fires on about 2 cylinders really fast...it really want's to go Very Happy but just wont, so tomorrow we will try some fresh fuel' no idea how long the original stuff has been in there' 'smells stale' Rolling Eyes ans we'll try it again , we've done everything else
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Re: how to find TDC on a 1.0 hijet

Post by HighlyJetted on Wed Jan 21, 2015 10:05 pm

Other common faults with these is botched vacuum pipes, and the idle screw set wrong.
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Re: how to find TDC on a 1.0 hijet

Post by Ryan 95 on Wed Jan 21, 2015 10:08 pm

Ohh OK. Well I did replace a vac pipe . where is the idle screw?
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Re: how to find TDC on a 1.0 hijet

Post by HighlyJetted on Wed Jan 21, 2015 10:31 pm

Under a rubber on the throttle body. On the top of the throttle body.

You'll miss it, then when you see the rubber bung and pull it out you'll wonder how you ever missed it.
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Re: how to find TDC on a 1.0 hijet

Post by Ryan 95 on Wed Jan 21, 2015 10:33 pm

Cheers, will have a look Smile
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Re: how to find TDC on a 1.0 hijet

Post by Ryan 95 on Thu Jan 22, 2015 9:18 pm

well, manage to get the van running by tow starting it, idle is well off as it goes straight to revving it's nuts off,
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Re: how to find TDC on a 1.0 hijet

Post by HighlyJetted on Fri Jan 23, 2015 12:52 am

Well if it won't idle, how the hell did you set the ignition timing?

It's got to be done at 1000rpm with the jumper in the bridge connector.
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Re: how to find TDC on a 1.0 hijet

Post by Ryan 95 on Fri Jan 23, 2015 1:04 am

Because I could get the strobe and the dot on the flywheel to line up perfectly, bridged the connector too 'engine light flashed',

But still revving high though on idle

Theres a lot of dirt and crud in the crank breather pipe, and throttle body etc, engine has not been looked after by the looks of it, also the fuel I drained out was rust coloured.

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Re: how to find TDC on a 1.0 hijet

Post by HighlyJetted on Fri Jan 23, 2015 8:20 am

The dot will move at different engine speeds.

Sort out your massive vacuum leak first, then re time it one it will idle properly.
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Re: how to find TDC on a 1.0 hijet

Post by Ryan 95 on Fri Jan 23, 2015 12:55 pm

Alright thanks.
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