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Engine tappet clearances

Require valve tappet settings for Mk1 Ford Cortina twin cam. Approx year 1965.
We assume it maybe .008' Inlet and .022' Exhaust?

This engine was also found in early Mk1 Ford Escorts

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  • Anonymous Mar 21, 2014

    setting valve clearances and gaps

  • Anonymous Mar 26, 2014

    valve clearance specifications

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According to http://freespace.virgin.net/tommy.sandham/databook.htm# Rocker Adjustment, the cold clearance is .008" intake/.018" exhaust in the non-GT 1500cc, and .012" intake/.022 exhaust on the GT. Sweet little car!!!

Posted on Mar 01, 2009

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12 th inlet and 14 exhaust will suffice as its not a racing car ,yes i know some of these older vehicles had different specs say a morris minor to ford 1.6 lotus cortina the difference was considerable but for a common cooking engine the gaps i have shown will suffice ,the main difference in the tappet settings on older vehicles was to allow for valve overlap but this was mainly on early sports vehicles as the camshafts couldnt always be machined to the right specs on a mass production scale ,But these settings i have given will do for around 90% of vehicles ,Make them too tight for speed by increasing valve overlap and the petrol economy goes through the roof make them too wide like a GT cortina at 22th exhaust and they sound like a bag of nails

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Just after engine torque settings for a 2 litre cortina 1981 cylinder head and crank settings


wow a real engine built by proper craftsman in dagenham ,well the head bolts are around 70 lbs ,tappet settings 12 inlet and 15 exhaust unless its the Gt version then they were wider but clacked like hell so fit a standard cam ,2.0 engine is valve free so if belt snaps you do not damage the valves ,timing for unleaded fuel which these engines will run on is about 6? static .timing marks are easy to see ,These engine are stelite coated valves and seats so even 1972 engine one the first engines will run on unleaded fuel .engine oil use shell rotella diesel /petrol as this was used on all ford engines in the assembly plant .Another tip use the 98 octane fuel as they were designed to run on 4 star petrol which was 97 octane .points gap 25th and plug gaps 25 as well ,cannot seem to remember the firing order though ,old age comes to us all iam afraid but i think it was 1243 but it could have been 1342 ,i should know i fitted enough plug leads in my time .

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I have problem with my engine 4K toyota. It heard an engine noise during idling, for my little knowledge in engine repair, can you give me any procedure mannuals in adjusting engine valves for my...


Valve Clearance Valve clearance is there to allow the valves to cool in between combustion events (spark), and to make sure the valve closes properly and contains the combustion explosion. You need to cool the valves a little bit, the exhaust valve moreso than the inlet, as it's what sees the most heat as spent burnt gases go past it into the exhaust port. Run too little clearance and you'll cause the valve to "weld" a little bit to its' seat every time it closes, and then take seat metal off again when it opens. Do this enough times and you burn out the valve seat and need the head reconditioned. However, by running less clearance, the valve stays open for that little but longer, and you get more air in and out of the motor, and make more power. Run too much clearance and your motor just sounds like a diesel and loses power and tappet rattle annoys you while you're driving, so it's better to err on the side of caution.
The stock valve clearance (0.008" inlet / 0.012" exhaust, warm) is pretty good for any of the cams I've listed above, they're well-sized street cams, not really wild top heavy race cams that require super high compression to work, so don't be afraid to close the valves up a bit from the suggestions of the cam grinder, which will usually say between 0.010" and 0.014". There are a few ways to set your valve clearances:
Yellow Book Method This is from the factory 3K/4K/5K engine manual, aka The Yellow Books. It's the quick and lazy method.
Set engine to #1 TDC. Crank pulley timing mark should be on 0, distributor rotor should be pointing towards spark plug 1 or 2. Set tappets (counting from the front) 1, 2, 3 and 5. Rotate engine 360 degrees, crank pulley to 0 again, distributor rotor turned 180 degrees. Set tappets 4, 6, 7 and 8.
Nine Method I've never really gotten into doing this, takes too much time and maths for my liking :P Rotate the engine through its' range of movement, as one valve is "on the rock" of its' max lift, subtract the valve number from 9 and that's the tappet you should be setting. For example, if #8 valve is open, set clearance on valve #1. If valve #7 is open, set clearance on #2. And so on.
Stewart uses this method, and rotates the camshaft through its entire base circle and sets the clearance at the highest point. Which is a pretty good idea, as it compensates for the possibility that the base circle has been ground unevenly, and allows you to run the proper valve clearance that you want to run, instead of something that may be a few thou larger in reality.

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1 Answer

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