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What are the valve tolerances? - 2005 Husqvarna TC 250

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Hello Brad...every brand has there own valve clearance to follow, you might contact Husqvarna distributor in your place, for sure they know it.You can play with it and you'll notice a noise or a smoke once your opening is not right.

Posted on May 26, 2010

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How to align the timing marks on camshafts and crankshaft when replacing a broken timing belt on a 3.0liter engine

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The 2.5 has zero tolerance between piston and values. I can rotate the crank with no problem. I think in is on TDC. If it is 180 degrees out would I be able to rotate the crank?

If there is zero tolerance between valves and pistons ( how did you measure it. (Head has to be on to get a reading) then I would say that there has been valve clash with the piston and the valves are bent. If that is the case then you will be able to turn the crank 360 degrees with little resistance.

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Remove the crankshaft tappet cap at the front of the motor and the timing inspection cap on the top right side of the rear cover.
Take off your valve covers.
Rotate the motor clockwise and align the TL mark with the pulsar index mark. Check that all the valves are loose on the left cylinder. The left cylinder must be at T.D.C. top dead center on the compression stroke.
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IN: 0.08 mm (0.003 in.)
EX: 0.10 mm (0.004 in.)

Adjust the valves on the left head first ("TL" mark). Loosen the lock nut, turn the screw until there is SLIGHT drag on the feeler gauge. It is very important that you do not over tighten the valves. The Rocker assembly floats on oil and will zero tolerance the valves all by itself. If you over tighten the valves it will push the rocker to one side and damage the rocker bearing/shaft. Hold the screw and tighten the lock nut . Recheck the valve clearances.
Rotate the crankshaft clockwise and align the "TR" mark on the rotor with the pulsar index mark. The right cylinder must be at T.D.C. at the compression stroke.Make sure all the valves are loose. Adjust the valves and recheck the tolerance after tightening.
Reassemble the motor.

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1 Answer

Checking my valve clearances I found my rhs inlet was 0.22mm which is 0.07 above tolerance as stated in manual. Will it tighten as the valve seat wears or should I get shimmed? All others were in tolerence...

It will not get tighter ,try shimming . Valve clearance is allowing for heat exspansion .a extra large clearance is noisy and will not allow the valve to operate properly .too tight a clearance will not shut off the valves and cause exspansion loss in the commpresson stroke .And in some cases the piston may hit the valve.Resulting in a loss of power.A loose or large valve clearance is noisy and will give your enging a sluggish performance.

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there is only one way to find out. That is to put a new belt on and hope for the best. You can't test anything with the belt off.

Other than removing the head the belt is your first choice.

Most of the time the valves do not bend.

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All engines, be they gas, diesel, electric or aeronauticle, require a tolerance of certain specification as to allow for lubrication of moving parts. An engine can be considered zero tolerance when it has siezed. Please elaborate for me why this question comes to mind. Thank you, Dana

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