Bent pushrods

[ThorH]

Opened the valve cover to adjust the valves today......this is what I found! The intake pushrods on #1 and #2 are bent. What would cause this? There does not seem to be any damage to the rocker or the valve end. Is there anything else I should inspect before I put 2 new pushrods in and proceed?

Thanks!

Thor

[SafeAirOne]

Cause? Possibly a slack or broken timing chain which caused the valve timing to get all out of whack which in turn had your pistons hitting top dead center with the valves still open, bending the push rods and breaking apart the tappets.

Of course, that's a worst-case scenario. You probably ought to thoroughly dismantle the thing for inspection, unless you happen to know that those pushrods weren't properly seated in the tappets for whatever reason.

[SafeAirOne]

Oh..A more appealing scenario might be...


The adjusters were backed off too far to keep the pushrods captivated and they came loose and got bent up and destroyed the soft metal tappets.

Is there any reason the adjusters would be slacked off prior to you going in and adjusting them this time?

[ThorH]

The adjusters do seem to be backed off quite a bit...but they all look approximately the same. There doesn't seem to be any damage at all to the adjuster or the tappet, just the pushrod.

I will turn the motor by hand and watch the vales do their thing.

This is the first time I'm in this motor, so everything is just as it was left by the PO. So, I really don't have much history on it.

[Momo]

Correct me if I'm wrong but I don't think it's possible to have a valve in the 2.25 strike the piston as it is not a zero clearance engine. I had a valve stick open once due to an overheat and the only damage was a bent pushrod because the tappet crashed the pushrod. (The head was overhauled anyway due to seat recession but the piston was undamaged.)

[SafeAirOne]

Correct me if I'm wrong but I don't think it's possible to have a valve in the 2.25 strike the piston as it is not a zero clearance engine.

Hmm. I'm not sure, to be honest. I'll have to retract my worst case scenario if the 2.25 is a non-interference engine.

The presumption was that it similar to its son, the 2.5, which is DEFINITELY an interference engine. Looking at the specs for both engines tells a story though--the stroke is longer on the 2.5 by a full third of an inch.

[Terrys]

Sticking valves will do this

[Apis Mellifera]

Possible hydro-lock damage?

PS: Is that antifreeze on the spark plug boot?

[Firemanshort]

It might be worth a check on the other push rods to see if they are slightly off, as well. Pull them out and roll them on a flat surface. If they are not straight, the wobble will be apparent.

As much of a pain as it is, I would really hard pressed to put this back together without pulling the head and taking a look-see.

[ThorH]

It is a drop of antifreeze. I had just taken the heater hose off to change it out....spilled a little!

I'm definitely going to turn the motor over a few times by hand to make sure everything is moving as it should. And i will check the other push rods.

Thanks!

[Sputnicker]

It's possible that there was insufficient oil getting to the head/rocker assembly/valve stems. Bending two pushrods means there's something very wrong. I'd start by and disassembling the rocker assembly and looking for evidence of blockage or scoring on the shaft (it will be on the bottom side. Then take out the spark plugs and use the starter to see if you are getting oil flow through the little hole under the rear rocker pedestal.

[4flattires]

+1 for the sticking valves. Seen this tooooo many times. Here's the typical scenario:

1. Vehicle has old gas.
2. Gas gums up between the valve and guide.
3. Delayed valve return gets met with downward rocker arm.
4. Bent push rod from off-center contact.

Been there....

[ThorH]

Haven't been able to work on the Rover for a little bit.

The gas was definitely bad. Drained it all out of the tank. Is there a way to clean the gummed up fuel around the valves without disassembling the head completely?

[4flattires]

Is there a way to clean the gummed up fuel around the valves without disassembling the head completely?

Short answer, no.

That being said, are there things that one could try to minimize the tear apart factor? Sure. On solution would be to remove the plugs and valve cover, spray the valve stems with quality carb cleaner while rotating the engine with a hand crank. Repeat until Arnold envies your biceps and you figure you are safe.

Fire that bad boy up again with yet another can of spray carb cleaner ready on the wing and run that can dry....down the carb throat while running (preferably on a warm day to minimize the holding power of gas varnish).

At any time, should you hear intermittent rocker arm clicking going on, you can assuredly be headed down the road of a future bent valve.

Open a frosty beverage and repeat, otherwise if no noise, open up a frosty beverage.

Jeff

[JimCT]

Marvel Mystery oil

use that in the gas, freed up sticking valves in our old flathead 6 marine engine