Onan Timing - 9020

[TerryZ 0]

Hi guys: Question on timing the onan CCKB on the 9020 Powr'max- since you can't see the ONAN timing marks on the fywheel side of the engine, I assume the timing marks are on the front of the engine - one mark (an engraved line) on the front pto which should line up with a similar engraved line on a flag mounted to the block - the point at which the points break. The points are breaking about 15 degrees too early. I slid the breaker box both directions full stroke, I can make it worse to 20 degrees or so but can't get any less than 15. Ideas? Is there a published procedure )other than the ONAN service manual wich describes the timingmarks on the flywheel side...).

[D-17_Dave 12]

I'm somewhat confussed as to what your actual problem is. The timeing should be 20 degrees before TDC. Therefor it will time OK like it is. However, you should be able to back the timeing down below 0 degrees. There is only one thing I can think of that would hold the timeing up that high and that's if the cam is a tooth to far advanced from the crank. Has anyone been in the engine lately that you know of? Even if will run this way the valve timeing would be off and not let the engine flow air properly. I have seen myself on one engine the crank gear installed inside out. It has a mark on the inside also and it's not in the same place as the correct one on the outside of the gear. You can tell if the gear is on properly if you do not see a groove in the inside of the gear next to the crank. This taper is only on the inner side of the gear and aids in starting the gear onto the crank. It should be flat against the crank if it's right. You can do a rough check of the cam timeing by pulling a head off and looking at the valves. Dureing TDC on the dead stroke the intake and exhaust valve should both be open evenly. Hope this helps out some.

[TerryZ 0]

Hi Dave: The engine has not been opend by me, but I cannot say what happened to it before then. Relative to the timing and the use of a timing light, Should I be using the mark on the front PTO and alin it directly to the line on the flag or 20 deg. before it? There are no other markings on that side of the engine. The real timing marks are on the flywwheel side towards the seat.

[D-17_Dave 12]

Yes, the mark on the flag is the 20 degrees BTDC so a timeing light and those marks are what you go by.