formula18

1989 gen IV 454 mervruiser

Hey guys i have an issue on my motor...i opened it up and discovered om the number 4 cylinder that the lifter collapsed on the exhaust side...im hoping that as i was running 3000rpms the side effect was that pushrod bent (on intake same cylinder)as it couldnt open valve becuase of first issue....just looking for some insite on the issue. I will be replacing both pieces...
Thanks,Harry

GPM

Just curious, how do you know it's a collapsed lifter ? any chance you lost a lobe or 2 off of the cam

formula18

I pulled it apart. Intake is off. Hydraulic lifter is hollow..

tommymonza

Sounds more like you had a stuck valve and the pushrod got bent because the valve was either froze in the guide or there was water in the cylinder when you 1st went to crank it up.

Redid a 2 - 454s last year in a cruiser that had this issue. Collapsed lifter could be a after result of the problem also.

f_inscreenname

Sometimes they just fail. Had one swell inside the liter bore this spring. Nothing like that has happened before.
fyi, it's a Mark IV. When you say "Gen" anything people naturally think its a newer motor.

formula18

No water in cylinder. Just checked it out...also the valves are not stuck...i just moved other parts over to this cylinder. And turned motor over.

commandersander

iTrader: (8)

And the result of a cam lobe inspection?

formula18

. Everything worked...cam was ok...any ideas what could of caused it? Or is this just something that could happen

SB

iTrader: (1)

So, your thinking intake pushrod bent because of trying to open against the pressure of a non-evacuated cylinder due to the innards coming out of exhaust lifter ?

tommymonza

I would put a scope in that cylinder and inspect it a little closer.Home Depot sells a Ryobi scope that has proved invaluable for multiple uses since i bought it for a 100 bucks.