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Re: Engine tappet clearances
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!!!
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no 1 piston tdc
the cam lobes for no 1 piston should in such a position so that a slight turn of the cam shaft one way makes the exhaust start to close and the inlet start to open or the other way the inlet start to close and the exhaust start to open
this is known as valve rock or valve overlap and occurs when the cam shaft is properly timed to the tdc position of the piston
for a twin cam engine the cam lobes position will be the same operation just that the inlet cam rock will be for the inlet cam and the exhaust cam rock will be for the exhaust cam
Unless the is a modified engine, there is no setting on the valve clearance. It has hydraulic valve lifters and they don't require any setting of the valve tappets.If they are making noise when it is running the you have a bad valve lifter. Unless you can get some kind of lubricant to add to the oil that will clean the lifters, you may have to install new ones.
please explain what you mean by top setting ? i am assuming you mean the tappets on this 8 valve engine which is the same as our europeon version called a fiesta and if so then 12 inlet and 15 exhaust,yes i know the ford escort with the same engine from the 60s had a wider gap and the GT escort had a gap of 22 exhaust but ?? showing my age
long time since i worked on big diesels but assuming their manual tappets and not hydraulic then use the norm i would set all engines too ,unless its a 60s GT type engine ,long story to get the vacumn right with high lift cams but a cooking engine like this then i would use 12th inlet and 15 exhaust ,this will get you out the woods so to speak ,this setting works on a ford D series engine ,a gardner ,a eagle diesel rolls royce ,in fact any truck engine apart from things like a 3lt V6 capri gt or a 1.6 gt cortina where as they made the cams have such a high lift they wouldnt idle on lower settings than 18th inlet and 21exhaust ,so in effect defeating the object of a GT engine ,but i dont have the time to answer on how to set up a racing engine .
Tappets......... perhaps is what your friend said. The tappets are part of the engine inlet and exhaust valve set up. Most tappets are self adjusting in modern motors, (Hydraulic).
The old fashioned tappets are manually adjusted during regular car servicing. This happens at set intervals, for instance every 20,000 miles.
Inlet valves allow air and fuel into the engine and exhaust valves let the burnt fuel and air out.
Tappets are fitted between the inlet and exhaust valves, they ensure that the valves open on time and more importantly close properly. If the tappet happened to be badly adjusted and did not let the valve close properly then damage to the valve and cylinder head can happen by burning.
If you have a significant power loss I would be surprised to find that the just tappets/valves were to blame.