Question about 1983 Mercedes-Benz 300-Class

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Valve clearance what is the tappet clearance on mercedes benz 123d car engine

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  • Anonymous Mar 17, 2014

    want to know how to set tappet clearance on a 3 cylinder chevy spark

  • Anonymous Mar 26, 2014

    tappet clearence

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Hello, For all 615, 616 (4cyl) and 617 (5cyl) through 1985 model year is:
cold intake 0.10mm or .006in
exhaust 0.35mm or .014in
hot intake 0.15mm or .007in
exhaust 0.40mm or .016in
CYA, Gator241

Posted on Feb 06, 2009

  • Wally Wicker Feb 09, 2009

    Hello again, If you find this information to be correct would you please enter a "fixya" rating.

    Thanks, Gator241

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Valve Clearances inlet and exhaust


j24b engine D.O.H.C.
U.S.A?
open hood , look up. see white sticker, see clearances.?
off online F.S.M
Valve clearance specification when cold :
59 to 77deg F or 15 to 25deg C (engine temps)
Intake: 0.0063 to 0.0094 inch (0.16 to 0.24mm)
Exhaust: 0.0123to 0.0153 inch (0.31to 0.39mm)
you must remove the bucket,tappet , to change lash.
MIKE IT (that means a micrometer)
then buy shims or new buckets to fit. (generic answer)
the book says buy correct tappet after measuring, yours.
and it's out of range, and doing the math first.

that is it.

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Mazda 6.2 engine valve clearance


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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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I know from experience with Mercedes diesels that correct tappet clearance is critical. As the engine wears you may need to accommodate for wear. I would adjust again closing the gap but, very very little. I would be careful not to overdo. I may be wasting my words but, make sure you are on the heal of the cam when making the measurement. Let me know if you need anything else.

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How to measure tappet clearance with dial gauge


When setting tappets, it has to be born inind that the valve stem wears an indentation into the face of the rocker. This prevents a really accurate tappet adjustment, so the customer is right again. If you do not posess a tappet setting dial gauge, a normal engineers dial gauge will do just as well. The procedure is the same as using your feeler gauge except that you set the dial gauge up on the cylinder head with the pointer resting on the head of the rocker. Press down fairly firmly on the rocker valve end and zero the gauge. Next lift up on the rocker and read off the clearance, from the gauge, Use a magnetic base to support your gauge and repeat the pocedure for each valve pair.

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