07-05-2019, 03:50 PM
3461
Re: Things that annoy you!
Originally Posted by spitfire
->
Forget that Pyxell, overhead valve engines were largely phased out in the 1970s, to be replaced by overhead Cams, that said, the wife's 1998 Ford Ka had an overhead valve engine. I remember Kenny Everett as Sid Snot having trouble with his Overhead Underhanger.
Trouble is, now I really do want to know!
07-05-2019, 03:53 PM
3462
Re: Things that annoy you!
Originally Posted by spitfire
->
Forget that Pyxell, overhead valve engines were largely phased out in the 1970s, to be replaced by overhead Cams, that said, the wife's 1998 Ford Ka had an overhead valve engine. I remember Kenny Everett as Sid Snot having trouble with his Overhead Underhanger.
07-05-2019, 03:57 PM
3463
Re: Things that annoy you!
Ok, it starts with a camshaft located sort of parallel with the crankshaft, the lobes of the cam operate pushrods, the other end of the pushrod operates a rocker (the rocker shaft is located in the same area as the modern overhead cam) the other end of the rocker operates the valves. Because metal expands when hot, there has to be a clearance to compensate, so there has to be a gap between the rocker and the valve, which needs to ba adjusted on a cold engine.07-05-2019, 04:01 PM
3465
Re: Things that annoy you!
Originally Posted by spitfire
->
Ok, it starts with a camshaft located sort of parallel with the crankshaft, the lobes of the cam operate pushrods, the other end of the pushrod operates a rocker (the rocker shaft is located in the same area as the modern overhead cam) the other end of the rocker operates the valves. Because metal expands when hot, there has to be a clearance to compensate, so there has to be a gap between the rocker and the valve, which needs to ba adjusted on a cold engine.
Originally Posted by spitfire
->
Thank you.
07-05-2019, 04:17 PM
3468
Re: Things that annoy you!
Originally Posted by spitfire
->
Ok, it starts with a camshaft located sort of parallel with the crankshaft, the lobes of the cam operate pushrods, the other end of the pushrod operates a rocker (the rocker shaft is located in the same area as the modern overhead cam) the other end of the rocker operates the valves. Because metal expands when hot, there has to be a clearance to compensate, so there has to be a gap between the rocker and the valve, which needs to ba adjusted on a cold engine.
So, it's the gap you have to adjust, not the tappet!
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