We show today how we set valve clearances on the bench on a cylinder head and we set about stripping a Cosworth engine, only to find yet again another near disaster was about to occur
Cosworth Lee with the magic touch on the valves 😎 Silicone sealant doesn't like oil, a long soak wth Screwfix silicone remover and industrial wipes are good for cleaning off with.
So glad to see some engine work being done and finding your knowledge a breath of fresh air, got well into the bucket machining and the old "Pat your head and rub your stomach" work lol, now looking forward to some Cossie rebuilding work
I was going for a flight in a helicopter in the States. I asked the owners wife if she flew a helicopter. She said son, I can't walk down the street and chew gum at the same time!
Doing the shim+bucket conversation to old VW 1.8 gti engines i aimed for about 5thou in and 12thou exhaust . Got the most out of the camshaft and lasted around 35k miles before needing reshimming.
"Mullered"? I get the meaning, but where ever did that come from. We dont have that here (USA) and it sounds quite useful. (I've already adopted "knackered".)
It’s derived from Romani Gypsy, “murdered”. East London used to be home to many a Romani Gypsy, quite a few interesting words. I like knackered as well, derived from “knacker” a person who used to slaughter horses. “Mullered” beats “Knackered”for severity, although they do mean different things really.
@@HuntsChrisvalid explanation definately- but recall from my linguistic anthropology days the words were also argued to originate slightly differently. ‘Mullered’ was thought to hail from the East Counties of England - primarily flour producing regions. To ‘mull’ something was to pulverise by grinding ie the flour mill stone. ‘Mullered’ being the complete destruction of something. ‘Knackered’ is by way of agreement, related to the equine industry. But some believe the regional origin of it to come from the Northern Counties of England. A knacker was traditionally employed to remove the danglies from unruly or aggressive Stallions. Hence some people referring to testicles as ‘knackers’ - again a more commonly used term in the North of England than South. But both are valid origins of the words - not disagreeing with you just a different viewpoint lol.
I rebuild the Ford Ecoboost 3 cylinder engine. Silicon is used to seal the front cover and sump. You leave the silicon 24hrs before filling with oil. You will end up with silicon in contact with oil. However I have never seen loose silicon in the sump or oil pump pick up.
I use Dirko HT silicone made by Elring on engines, gearboxes and transmissions that i repair and re build, it never comes off inside an engine unlike bathroom silicone which i have seen used by clowns in engine rebuilds.
Hi Lee. Looking at the escort head the buckets look a bit scored on top. At what point would you consider renewing or perhaps surface grinding the face of the bucket.
Are those lower left buckets okay, their cam faces look distinctly "mullered" (Cosworth-speak?) to me and not smooth . Swapping some valves around might reduce the material needing ground off. Does grinding valve stems back not damage the surface characteristics of the steel and foreshorten their lifespan? If you are getting a lot of work on Cosworths surely the extra expense on new buckets of right clearances is worth the added expense and would generate a lot of serviceable used and varied clearance stock that could also be used.
Could you check all the clearances first before grinding to check none were to loose? With potential to swap valves around for a tight one? Just in case one has to big a clearance and can't add material 🤔
H i Lee You have probably already answered question before but do you dabble in motorcycle engines. I have a couple engines I am lookig to refresh just to make sure they are ok. Many thanks Guy
Can not help but think when i see that Cosworth engine with the silicone and lose bolt on the oil pump etc that anyone buying a rebuilt engine or a car with a rebuilt engine that either they ask for a receipt and check it has been built by professionals like your selves or just buy it and assume it needs rebuilt again. No mater how good a rebuilt engine sounds etc is immaterial unless built correct as it could be actual worse than an old worn engine?
Lee, I have never heard the term "buckets" used before when talking about engines. Are these "buckets" only found on Cosworth engines? What do the do? Thanks
Buckets are used on many overhead cam engines - e.g. VW, Alfa, etc. The bucket accommodates the valve stem and springs and provides a 'constrained' surface for the cam lobe to contact in order to push down (i.e. open) the valve.
Probably most of the classic twin cam engines, e.g. Alfa Romeo and Jaguar from the 1950s used bucket tappets, Fiat and Lotus in the 1960s, the Toyota 4A-GE twin cam in the 1980s and others. Quite a lot of SOHC engines used them, from the little Hillman Imp engine from the 1960s to the Jaguar XJS V12. Depending on where you are from, you might hear the phrase 'cam follower' or 'lifter' instead of 'tappet'.
Well I have just learned something.I didnt realise there was such a make up as 5 valves per cylinder.So out of touch.The camshafts must be very complex.
The camshafts are no different from a 2 valve per cylinder cam shaft except they have extra cam lobes, a 20 valve four cylinder with rocker arm set up is a bit more complex looking but its still simple except it is crammed into a smaller space
Yamaha launched a bike with 5 valves per cylinder in about 1984. Aprilia launched an engine with a radial 5 valve head in the early 1990s - 4 valves opened directly with skew ground cams a one by a rocker.
My dead dad is turning in his grave that you don't shut the door and the traffic noise is driving his ears nuts and he's dead. Can't turn it off. Tinnitus is a real thing. but shouldn't be on bloody you tube
