Question about Craftsman 42 in. Deck 19.5hp Lawn Tractor

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My lawn mower will not start, it has spark but 0 compression.

The intake pushrod was broken in two
both pushrods were replaced
this is the second time the pushrods came loose
the valves open and close, but i think they are not in time
the gas supplly is ok
gas can be put into the carb
with zero compression no engine will start

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A bent or broken pushrod is just a symptom of a larger problem that is causing a valve to hit the piston (or vice versa). Since you say the valves open and close, it's probably not a bent valve shaft, and like you suggest, it's the valve timing which is controlled by the camshaft gear. No matter what, it's not a repair to tackle at home. If the mower's in warranty, take it back for a proper repair -- and consider trying a different shop than last time. If it's out of warranty, you might find a small engine mechanic that can fix it for less than the price of a new motor. Get a good estimate before you say yes.

Posted on Jul 03, 2010

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How to install rocker arms on a Pontiac grand am 2001 V-6


Hi there:

Rocker Arms & Pushrods


Removal & Installation

3.1L & 3.4L Engines
Left Side

  1. Before servicing the vehicle, refer to the precautions section.
  2. Drain the cooling system to a level below the coolant pipe on the front of the engine.
  3. Remove or disconnect the following:
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To install:

  1. Lubricate all the valvetrain components with engine oil.
  2. Install or connect the following:

    Pushrods and the rocker arms. Torque the bolts to 24 ft. lbs. (32 Nm).Rocker arm cover using a new gasket. Torque the rocker cover bolts to 89 inch lbs. (10 Nm).PCV valve and hoseHeater bypass pipe. Torque the screw at the water pump to 106 inch lbs. (12 Nm), the bolt at the cylinder head corner to 18 ft. lbs. (25 Nm) and the nut to 18 ft. lbs. (25 Nm).Spark plug wiresNegative battery cable
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3_4_2013_5_26_48_pm.gif


Right Side
  1. Before servicing the vehicle, refer to the precautions section.
  2. Remove or disconnect the following:
    NOTEKeep the pushrods in order. Intake pushrods are 5 3 / 4 inches long and exhaust pushrods are 6 inches long.


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To install:

  1. Lubricate all the valvetrain components with engine oil.
  2. Install or connect the following:

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  3. Start the vehicle and verify no leaks.





Hope this helps.

Mar 04, 2013 | Cars & Trucks

1 Answer

Mower was running until it stop and would'nt start found out the one of the push rod was broke replaced it and now i can't get to start and its flowing out the plug


A broken pushrod can indicate an engine with out of sync valve timing. It may be that a piston slapped an open valve snapping the pushrod...neither one is good, you may need to tear this one down.

Sep 19, 2012 | Garden

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I have a 1988 HD Springer Softtail and have purchased a set of Andrews E-Z insall pushrods. I need to know how far down to go and how many turns up I need to go. I also need to know if I need to turn the...


The easiest way to install the pushrods is to bring the piston of one cylinder to top dead center on the compression stroke. This means the piston is at the top of its travel in one cylinder with BOTH lifters down in the tappet blocks. Use an ordinary plastic drinking straw, nothing else, to check the position of the piston with. The plastic drinking straw will not damage the piston nor break off and drop into the cylinder while checking the piston position.

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Begin by putting your finger over the front spark plug hole and turn the rear wheel slowly in it's normal direction of rotation until you feel compression blow your finger off the spark plug hole. Then, insert the drinking straw into the plug hole down to the piston. Continue turning the rear wheel while monitoring the movement of the piston. When the straw comes all the way to the top, stops, and starts to move back down ever so slightly, you are at or just barely past top dead center. Put the appropiate pushrod tube seals in the heads and the tappet blocks. Check to see if all four pushrods are the same length. If two of the pushrods are longer than the other two, the long ones are the exhaust pushrods. Assemble a pushrod and it's tube and insert it into either the intake or exhaust position. Turn the adjuster outwards making the pushrod longer until it seats in the rocker arm socket at the top and the tappet socket at the bottom and you can no longer turn the adjuster with your fingers. Take the appropiate size wrenches and lenghten the pushrod by three or four more full turns (18-24 flats). This is not critical as the tappets are hydraulic and have approximatelky 0.150" travel in them. Lock the locknut on the adjuster and then procede to install the other pushrod on that cylinder. DO NOT TURN THE ENGINE OVER UNTIL THE TAPPETS BLEED DOWN AND YOU CAN AGAIN TURN BOTH PUSHRODS WITH YOUR FINGERS. Once the tappets bleed down and you can spin the pushrods you just installed with your fingers, rotate the engine until the piston in the other cylinder is at top dead center on the compression stroke. Install the pushrods in that cylinder in the same manner as you did in the first cylinder. Refer to Page 17 of the PDF file that you can download at this site for instructions.
http://www.andrewsproducts.com/Downloads/andrews_motorcycle07.pdf

Good Luck
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Sep 05, 2011 | Harley Davidson FXSTS Springer Softail...

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Jul 06, 2011 | 1999 Pontiac Grand Prix

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  1. With the engine on the compression stroke, adjust the exhaust valves of cylinders No. 1, 5 & 6 and the intake valves of cylinders No. 1, 2 & 3 by performing the following procedures:
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  2. Rotate the crankshaft one complete revolution and align the mark on the damper pulley with the 0? mark on the timing plate; the engine is now positioned on the No. 4 firing position. This time the No. 4 cylinder valves remain closed as the timing mark approaches the scale. Adjust the exhaust valves of cylinders No. 2, 3 & 4 and the intake valves of cylinders No. 4, 5 & 6, by performing the following procedures:
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Sep 23, 2010 | 1997 GMC Jimmy

1 Answer

Engine runs fine til hot.


I think one of the intake valves, or a valve pushrod, is bent or warped. When the engine heats up, the metal expands and the valve starts sticking open. That would cause compression to be lost in one cylinder, reducing available power so things drag when you engage the blades. This would also causes air/fuel to be blown back through the intake. I think you'll need to take it to a small engine mechanic. Good luck! Please rate my solution if helpful, thanks.

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