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Why did the aluminum intake pushrod brake on a 17.5 Briggs and stratton eng?
Wiki User
∙ 10y ago
In normal operation the pushrod rotates. It also flexes under vibration and load. As it rotates and flexes it contacts the hard plastic insert that it passes through in the pushrod guide plate. It takes a while but the insert burnishes the rod so thin in that spot, it breaks. The process also changes the length of the rod and therefore the valve lash, so I always readjust the intake valve (or the one with the compression release) as soon as the starter starts to stall into the compression stroke on startup. Or at every oil change or tune up whichever come first. When I do, I back the rocker nut off far enough to remove the pushrod and inspect it. If its starting to wear a dish shape into the rod I flip the rod end for end and reinstall it. It can start wearing on the other end until it goes dish shaped then I replace it.
In closing just one other possiblity that usually bends the rod rather than break it is old varnished fuel stuck the valve in its guide and the rod gave way on start up or soon after.
Wiki User
∙ 10y ago
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Timing on all Briggs & Stratton small engines is set at the factory and non-adjustable. It is determined by the placement of the armature (coil) and position of flywheel on crankshaft. Unless the crankshaft is bent or the flywheel key is sheared (both are possible after an impact or sudden stoppage), timing is perfect. Rough running is likely an intake or mechanical problem.
Your 1993 El Dorado blew a hole in the air mixing aluminum cast housing where the fuel injectors are?
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What is the purpose of the pushrod?
The pushrod is actuated by the camshaft for the purpose of actuating the lifters/rocker arms which, in turn, pushes open either an intake or exhaust valve in the cylinder head.
How do you set the timing on a Briggs and Stratton 14 hp motor?
Timing on all Briggs & Stratton small engines is set at the factory and non-adjustable. It is determined by the placement of the armature (coil) and position of flywheel on crankshaft. Unless the crankshaft is bent or the flywheel key is sheared (both are possible after an impact or sudden stoppage), timing is perfect. Rough running is likely an intake or mechanical problem. Backfiring is likely a carb problem
