HELP!!!!! Here we go again

[WNY964x4]

that engine is in pieces in a cabinent in our garage , and the block is sitting on a snowmobile dolly on the floor , and all i know is that the number 4 connecting rod bearing went to hell , and all the other rod bearings looked a little funky , but all the mains were fine

 

[Wicked_Sludge]

i wonder if #4 being the last one on the crank, furthest from the oil pump has anything to do with it.

sounds like an oil pressure problem alright. but like i said before, it could have been due to low oil pressure, not no oil pressure.

EDIT: scratch that, #1 is the last one on the crank.

 

[WNY964x4]

that could possibly be , because that would make sense , since my pressure guage acted up the entire time

 

[Wicked_Sludge]

the reason your oil pressure gauge "acts up" is because its a switch set to about 7 PSI. because oil pressure is never 100% steady, if your producing pressure at around 7 PSI, the switch will open/close/open/close in rapid sucession, making the gauge wig out. 7 PSI is the bare minimum required to float the crank at idle. if you were getting 7 PSI driving down the road (and evidently, you were) then thats certainly enough to tear the bottom end out of the motor.

 

[madoublet863]

Glad i found someone with a same problem thats when i decided to do the v8swap i have a 91 ford ranger 3.0l 5speed manual got the motor to run good in netural soon as i put in gear it started to have a rough idle and my oil pressure gauge went crazy i even LOSS huge amounts of power never found out the problem since i work at a parts store they let me back and trouble shoot sensors i tried everything one day it would have power the next it wouldnt then i figured out the days it had power i could gun it and get it warmed up just seeing if it was going to act up since it was running good and it did so i could practically make it run bad; anyways i finally word of advise and i pulled the valve cover off and i had a bented to hell push rod futher noticed the valve was bad so i already had the 302 so i yanked the 3.0

 

[Wicked_Sludge]

the oil pump is driven by the engine. putting the truck into gear makes the idle drop by a few hundred RPM, thus the oil pressure will drop some too. if your barely above 7 PSI with it idling in nuetral, then of coarse putting it into park will cause the oil pressure gauge to drop.

i dont think the bent pushrod was your initial problem. theres no way a bent pushrod could cause intermittant issues....its not like it can unbend itself.

 

[ati190]

a failing cam syncro CANT cause intermittant oil pressure problems. the syncro either works, or it fails

^ his outlook is fantastic. nice way of putting it wicked

 

[WNY964x4]

the oil pump is driven by the engine. putting the truck into gear makes the idle drop by a few hundred RPM, thus the oil pressure will drop some too. if your barely above 7 PSI with it idling in nuetral, then of coarse putting it into park will cause the oil pressure gauge to drop.

i dont think the bent pushrod was your initial problem. theres no way a bent pushrod could cause intermittant issues....its not like it can unbend itself.

well my guage was dropping when i put it in gear , in park it was fine , but i havent had the problem , it works fine enough that about 20 mins ago , on my way home from the gas station , i stopped and pulled a chebby trailblazer out of a snow filled ditch

 

[Wicked_Sludge]

oil pressure is also related to oil temperature, it may be that you just havnt gotten it as warm as you had it before.

mechanical oil pressure gauge.