Hi all. I have a late 1957 Massey Ferguson 35 with an English 'Standard Motor Company' petrol engine in need of valve / tappet adjustment. The manual states .012 thou for the inlet and .008 thou for the exhaust. The rockers dont use rotating collars on the pushrod ends. The clearance values seem odd, I always thought exhaust valves needed MORE clearance not less than their inlet companions. Any ideas why the difference ? Or is it a typo which has carried on from Noah. :?
- Thread starter henrysow
- Start date
Bob Bancroft
Well-known Member
- Location
- Aurora NY
That sure is different! I just did a Continental Y112 flat head. Intake .012" exhaust .020"
Steve@Advance
Well-known Member
It does sound unusual.
But poking around the interweb I see the same numbers coming up.
There was one caution to set them very carefully or they will be noisy.
There are formulas for setting them, turn the engine to one position, set some, turn it and set others...
I prefer to pull the plugs so it is easy to turn, put the feeler gauge in each valve and turn the engine through, finding the loosest point for each valve. Then start it up with the cover off, listen for any that may be loose, just in case.
But poking around the interweb I see the same numbers coming up.
There was one caution to set them very carefully or they will be noisy.
There are formulas for setting them, turn the engine to one position, set some, turn it and set others...
I prefer to pull the plugs so it is easy to turn, put the feeler gauge in each valve and turn the engine through, finding the loosest point for each valve. Then start it up with the cover off, listen for any that may be loose, just in case.
shaun wallace
Well-known Member
according to I&T MF-14 that is correct lash for Standard diesel engine.
old
Well-known Member
- Location
- Camdenton Missouri
Isn't the petrol engine the same as gas?? Not diesel??
Bob Bancroft
Well-known Member
- Location
- Aurora NY
Have seen those formulas for engines. I guess it saves time, as you can set several valves at a time. I have long had the habit of setting one cylinders valves at a time with piston at TDC on compression.
timcasbolt
Well-known Member
The eoic method works on any pushrod engine. You can google it for an explanation.
Thanks for the feedback.
Correct, in OZ we call it petrol and in the USA its gas, but it all gets confusing when you add VO or 'Vaporising Oil' and 'Lamp Oil' engines in the lineup.
As per a reply the valve clearances are also .012 for inlet and .008 for exhaust on the 4 cyclinder diesel engines, with the additional notes; inlet "Inlet valves fitted with loose caps" ??, outlet " 'Free' type exhaust valves". ??
I can only guess it must be peculiar to the British engine, perhaps the exhaust runs cooler ? I'm still lost to know why. :?
Correct, in OZ we call it petrol and in the USA its gas, but it all gets confusing when you add VO or 'Vaporising Oil' and 'Lamp Oil' engines in the lineup.
As per a reply the valve clearances are also .012 for inlet and .008 for exhaust on the 4 cyclinder diesel engines, with the additional notes; inlet "Inlet valves fitted with loose caps" ??, outlet " 'Free' type exhaust valves". ??
I can only guess it must be peculiar to the British engine, perhaps the exhaust runs cooler ? I'm still lost to know why. :?
Dieseltech
Well-known Member
- Location
- Akron, Indiana
That's correct for the Standard 23C. I set four cylinder valves this way, to set both on cylinder one watch the number four rockers at the exhaust/intake overlap. With the exhaust ALMOST closed and intake STARTING to open, set both valves on one, as one and four are at TDC together. Firing order is 1 3 4 2, turn engine clockwise 1/2 turn while watching number TWO rockers at overlap and set both valves on three, turn 1/2 turn watching number one rocker overlap and set valves on FOUR, another 1/2 turn watching number three rockers overlap and set both number TWO valves. Also works well on six cylinder inline engines with 1 5 3 6 2 4 as 1 and 6, 2 and 5, 3 and 4 are paired together.
Many thanks for all the tips and tricks to set the valves which I shall use.
I understand that the valves need clearance and so forth,but am still puzzled to know WHY the exhaust valve is set with LESS clearance. Surely the exhaust valve gear should have a larger clearance due to heat as it does in the case of other motors.
One thing I have noticed is that the Standard petrol / gas engine fitted in the Brit Vanguard motor car (very similar to the one used in the Ferguson) uses three springs on the exhaust valve with a larger clearance value.
Will use the values given in the manual and listen / look fior any changes.
Cheers
The only explanation I can think of is the lobe ramps for intake and exhaust are quite different on the camshaft. This is more true on a diesel engine than a gasoline engine as there is no/minimal restriction on the intake and there is significant pressure restriction on the exhaust.
This is only a guess, but the all I can come up with.
This is only a guess, but the all I can come up with.
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