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What happens if valves are out of spec?
If the valve clearances get too loose, this will lead to a noisy running engine and will eventually damage the camshaft lobes, rocker arms ( if equipped ) and the tips of the valves themselves.
What should do if the valve clearance is out of spec?
If your valve clearances are outside of the preferred tolerances set by your bike’s manufacturer, you’ll need to change the shims on the valves. To remove the cams to access the buckets and shims, you’ll need to loosen the timing chain. Most bikes run automatic cam-chain tensioners.
How do you know if your valves are to tight?
If the valve clearance is too small; the valves will never fully close, when they should. As a result, this will eventually burn part of the valve surface off; causing a constantly misfiring engine. On the other hand, if the valves are too tight; the engine may be running rough, either cold, hot or all the time.
How much torque does an Onan head have?
Onan Head Torque Specifications. Other Onan Toque Specifications Timing Cover – 10 Foot Pounds Rear Bearing Carrier – 25 Foot Pounds Rod Bolts (Steel Rods) – 27-29 Foot Pounds Rod Bolts (Aluminum Rods) – 12-14 Foot Pounds Flywheel – 50 Foot Pounds Intake Manifold 5/16″ Bolts – 10 Foot Pounds Intake Manifold 3/8 Bolts – 25 Foot Pounds
What is the valve clearence in a Onan-engine?
The Onan manual describes a procedure that does allow adjusting both valves without turning the crank. That takes a few minutes off the time and also gives direction to those of limited mechanical abilities. The OP apparently was not aware of, or couldn’t find, the timing marks. He mentioned head removal so he could see the piston.
Which is the front end of an Onan engine?
This manual contains proper information for the servic ing and overhaul of your Onan engine. Use the parts catalog in the rear portion of this book to help you with disassembly and assembly procedures. NOTE: Flywheel end of engine is considered the front.
Can a Onan engine be rebuilt without turning the crank?
Yes, I have rebuilt many engines of all types including Onan. The Onan manual describes a procedure that does allow adjusting both valves without turning the crank. That takes a few minutes off the time and also gives direction to those of limited mechanical abilities.