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        General >> Problems >> tdc
        
(Message started by: bobo_490 on Jul 19^th, 2008, 11:38pm)

Title: tdc
Post by bobo_490 on Jul 19^th, 2008, 11:38pm

any body any idea of tdc marks on crank pully on a cosworth mine has three marks on it any idea

Title: Re: tdc
Post by grandadman on Jul 20^th, 2008, 12:21am

I have exactly the same question :-/ ??? :o

Title: Re: tdc
Post by Simmo on Jul 20^th, 2008, 7:17am

Does THIS (http://www.fordscorpio.co.uk/manual/engines/24v/24VTimingChain.pdf) help?.

Title: Re: tdc
Post by grandadman on Jul 20^th, 2008, 12:39pm

Hi Simmo thanx for you help have a look at THIS (http://www.x100p.co.uk/tdc.html)

confused.com :-/

Title: Re: tdc
Post by Simmo on Jul 20^th, 2008, 1:23pm

Grandad. I have to confess all this is beyond me BUT have you noticed that in your link,if you move the cursor on to the pulley below the large black arrow, a 'pop up' says TDC?. It looks as though it is showing some sort of 'peg' in the block aligning with the left hand notch??.

Title: Re: tdc
Post by grandadman on Jul 20^th, 2008, 2:13pm

Hiya. That is what I called the pic tdc it's an internet id of mine.

That peg is a static item attached to the block as a reference point to which one turns the engine to a point where there is 'perfect' alignment for tdc [I think for #1 cylinder I'm not sure about this bit] the problem is that we have three yes three variable notches on our pulley hence the question Why three :-/
moreconfused.com ??? ??? ??? ??? ??? ??? ??? ??? ???

I have moved the pic to here

http://www.x100p.co.uk/tdc.jpg

Title: Re: tdc
Post by grandadman on Jul 20^th, 2008, 10:08pm

Sorted (http://www.x100p.co.uk/tdc.html) . the diagram is absolutely corect 8)

http://x100p.co.uk/tdcfin.jpg

Testing; confirming tdc on cyl #1
http://x100p.co.uk/tdctest.jpg

unconfused.com ::)

Title: Re: tdc
Post by Simmo on Jul 21^st, 2008, 6:58am

Well done Grandad ! :D. The other marks remind me of the days when you used a 'strobe' light to adjust the timing ie: the ignition point was so many degrees before TDC and you twisted the distributor to get it right!!. Only some of us will remember those days! ;D

Title: Re: tdc
Post by peteHull on Jul 21^st, 2008, 8:31am

The first mark would be ?deg before TDC surely so second mark would be TDC and third one, I don't know... for luck maybe? ???

hth
Pete