msmallenginerepair
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- Aug 21, 2015
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- 15
Hi guys and gals, a client of mine just bought an Ariens tractor with a 2015 Briggs, MOD: 33R877 0009 G1, CODE: 150109ZD. He called and told me that the starter was overheating and wouldn't crank the engine over. I took a look at it and found that the engine was locking up on the compression stroke and figured it just needed a valve lash adjustment. I told him to get on the phone and let the warranty work, but whoever he spoke with told him that the valve lash service wasn't covered under warranty. So I decided to take a look. The service manual tells you to:
1. Turn crankshaft counterclockwise until piston is at top dead center on the compression stroke. This prevents the compression release from holding the valves open.
2. Insert a narrow screwdriver or rod into the spark plug hole as a gauge, then slowly turn crankshaft counterclockwise until the piston has moved down the bore by 1/4
3. Using a feeler gauge, adjust rocker nut to obtain the clearance as listed (.003 - .005 in. for both intake and exhaust)
4. Hold rocker nut and tighten the rocker ball setscrew to the torque valve shown in Section 12 - Engine Specifications.
5. Check clearance again and re-adjust, if necessary.
6. Repeat for other valve.
I did this, put the spark plug back in, turned the engine over by hand and it is still locking up on the compression stroke. So then I turned to all of the old tricks up my sleeve and nothing has worked so far. Another tech told me that the compression release spring on these engines have a tendency to break or come off. What do you guys know about this? Any other suggestions? I know some of you will probably say, "It's under warranty, just take it in to an authorized dealer for repair", and I agree with that. But I would like to know more about this issue and gather as much information for my personal use as possible. And yes, I called Briggs. They told me, ..."just take it in to an authorized dealer for repair". No help. Thank you in advance!
1. Turn crankshaft counterclockwise until piston is at top dead center on the compression stroke. This prevents the compression release from holding the valves open.
2. Insert a narrow screwdriver or rod into the spark plug hole as a gauge, then slowly turn crankshaft counterclockwise until the piston has moved down the bore by 1/4
3. Using a feeler gauge, adjust rocker nut to obtain the clearance as listed (.003 - .005 in. for both intake and exhaust)
4. Hold rocker nut and tighten the rocker ball setscrew to the torque valve shown in Section 12 - Engine Specifications.
5. Check clearance again and re-adjust, if necessary.
6. Repeat for other valve.
I did this, put the spark plug back in, turned the engine over by hand and it is still locking up on the compression stroke. So then I turned to all of the old tricks up my sleeve and nothing has worked so far. Another tech told me that the compression release spring on these engines have a tendency to break or come off. What do you guys know about this? Any other suggestions? I know some of you will probably say, "It's under warranty, just take it in to an authorized dealer for repair", and I agree with that. But I would like to know more about this issue and gather as much information for my personal use as possible. And yes, I called Briggs. They told me, ..."just take it in to an authorized dealer for repair". No help. Thank you in advance!
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