Question about Eastern Tools & Equipment ETQ TG72K12 Gas Powered Portable Generator with Electric Start

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Keeps bending pushrods

Bought used had broken rocker arm bent rod replaced both push rods and arm it did it again after a week

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Several things can this, Carbon build up causing valve to piston contact, wrong valve springs , too strong or coils compressed be fore valve fully open, valve bounce caused by worn camshaft or weak valve springs. All ways replace a bent push rod don't reuse.

Posted on Jun 23, 2015

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It sounds like your tolerances on cams, etc, inside the engine are out of spec causing this problem. I would do a complete teardown of engine to properly diagnose.

I’m happy to assist further over the phone at https://www.6ya.com/expert/layne_0fccff498c319c32

Posted on Mar 09, 2014

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1 Answer

Whats the cause of a slightly bent pushrod and a rocker arm to nearly come off?


the high lift cam has no compensation and so the valve retainer bottomed out causing the rocker to slip sideways and bend the push rod
you would have been better fitting a prolonged duration cam rather that a high lift for the following reasons
1 --- you can used standard rocker gear
2 ---there is no valve bounce at high rpm
3 --- smoother air flow in the inlet manifold so there is not such a stop/ start action when rpm is low
4--- less wear on cam followers and cam lobes
cam shafts are all about open duration so longer open with smaller lift is better than the same duration with a fast up and down action

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1 Answer

Leaking rocker box gasket


Rocker arms have to be removed, BUT newer push rods are NOT adjustable, so you just can't loosen the push rods.

On the cylinder you're working on, BOTH valves MUST be closed.
EVENLY loosen rocker arm mounting block bolts, a little at a time.

Also, IF you remove the push rods, they are different lengths, so pay attention which one goes back where!

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look under the rocker arm to see the size hole the push rod sets in that will tell you what rod goes where

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Briggs and stratton 24 hp v twin keeps loosing push rod


are you setting the valve clearance right?? is the pushrod bent?

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My cement mixer stopped working today took engine apart and one of the push rods are bent shop wants 180 pounds to fix it but a Push rod is only 3 pounds is this easy to do myself? Engine is a honda...


Hello...ok..the first thing you want to consider is why the push rod bent in the first place...This usually happens because the cylinder is full of fuel because the spark plug is not firing...but this is for multi cylinder engines...
have you ever changed the oil???..You have to do this..even on small engines...If this engins has a pull starter..Did it turn over or did it sieze up....If it turns over...carefully remove the rocker arm....replace the bent push rod...it should pull straight out after you remove the rocker arm..replace the rocker arm....re assemble the engine parts using the proper gaskets...making sure everything is sealed...drain and replace oil.If the engine siezed up...then you have to get to serviced or replaced..I hope this was helpful.....let me know...PEACE...

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I have a 1999 Buick Century V6 3100 that I had to replace the intake gaskets due to antifreeze leaking into and out of the engine. When I had it all apart I noticed the very first lifter #2 cylinder...


If the engine oil was full of antifreeze when the intake gasket went bad, then there is a good chance that there may be some cam and/or lifter damage. A more likely cause of your problem would be that the push rods got mixed up when you put it back together. The intake and exhaust rods are different lengths. If this is the case, and you have turned the engine over, there is a good chance that you now also have a bent pushrod and intake valve. The exhaust pushrod is the longer one and if you mix them up, the piston will contact the intake valve because it will not be able to close due to the longer pushrod. This will bend or break the pushrod and bend the valve stem.

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1 Answer

Craftsman 16 HP Electric start 41" mower - on a overhead valve briggs and stratton two stroke engine the hollow push rod bent. We pulled the head and everything seemed in working order. The replacement...


On any pushrod engine you have to make sure that the timing is correct or nearly correct when first firing it up, if you had the cam in the wrong position the pushrod had no place to go when the cam lobe came around=bend push rod.

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2 Answers

Rocker arm come out on jeep chrysler 3.7 eng


A rocker arm is the arm that sits on top of the valve stem and connects to the push rods 'the push rods sit on the cam so when engine is running, the push rods go up and down in a timed sequence and with the rocker arms, open and close the inlet and exhaust valves. the rocker arm is located inside the valve(rocker)cover .If the rocker arm gets loose or comes out.
Check the nuts on the shaft which holds the rocker arms.either the shaft or nuts are got loose.They need to be tightened.Don't make it too tight or too loose.  Too tight,and they don't flutter right. Too loose,and they allow the rocker arms to wiggle out of whack. Other possibility can be  something is broken, bent, collapsed, or out of adjustment. 
Thanks. you can rate this solution and show your appreciation.



May 20, 2010 | 2002 Jeep Liberty

2 Answers

Recurring bent push rods/knocking engine- ideas?


I have seen this myself on a 3.4L (2.8, 3.1, 3.4, 3.5 & 3.9 are all mechanically the same engines). The valves may have a varnish build-up on their stems causing them to stick in the guides.

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