What actually happend when I reversed oil hoses??
 

Ok guys after running all summer with my hoses reveresed to my remote oil filter and cooler I spun a rod bearing :eek: Imagine that! Always showed 50 pounds running and never went below 20 at idle after the oil got hot and thinned. Wouldnt the bearings still get oil? Why would it cause it to spin a bearing?

Re: What actually happend when I reversed oil hoses??
 

Good pressure but the wrong way through the filter so you were seeing backpressure and low flow possibly??

Re: What actually happend when I reversed oil hoses??
 

As long as your reading your oil pressure at the block off main oil gallery,its got that amt of presure no matter how it got there, If reversing the flow caused a considerable drop in volume then oil pressure would drop as engine rpm's increased(engine demand -gallons per minute increases with rpm's). I am guessing it did something funny as it flowed thru your filter causing dirty oil to enter your engine and run thru your bearings or it caused your oil to go thru your block bypass valves and you weren't getting hardly any filtration or cooling.

Re: What actually happend when I reversed oil hoses??
 

Sounds about right

Re: What actually happend when I reversed oil hoses??
 

Wouldn't dirt just be trapped on the other side of the filter elements and still in a sense be filtered?

As Artic said, you had pressure. No matter how it was plumbed, oil still flowed out the correct block port, and then back in the correct port. UNLESS... I'm not sure, but if oil was traveling backwards thru the filter, would it hold the filters bypass valve open and still allow full thru it? Or would it seal the filter shut forcing the oil to not flow thru the oil cooler and filter, and just pass thru the blocks internal bypass valve?

Re: What actually happend when I reversed oil hoses??
 

Why would the oil lines be reversed in the first place? And yes if it was an anti-siphon filter then no oil should have made it's way through the filter. It would have bypassed at the pump allowing superheated unfiltered oil to recirculate.

Roby

Re: What actually happend when I reversed oil hoses??
 

The oil lines got reversed because I was not paying attention when I installed the engine :eek: Should have known better with all my years but...

Yes oil filter had an anti-siphon valve
But even if it didn't wouldn't the oil stop flowing when it hits the pressure relief valve in the block?

I still don't understand how oil could be flowing to bearings or lifters.

I have at least 30 hours on this mistake and the only thing I noticed was oil getting thin becuase of the heat issue. But still 20 pounds at idle should not cause you to spin a bearing

Re: What actually happend when I reversed oil hoses??
 

The oil prbably was not flowing well through the filter well so it was bypassing. The Mark IV engines had a bolt on canister with a valve that would alloe oil to flow to the bearings if the filter was clogged. Later Gen engines had the bypass valve on the block. UNFILTERED, oil was flowing to the bearings, that could cause some problems even with good pressure.
Just my $0.02
Gary

Re: What actually happend when I reversed oil hoses??
 

Thats my question. I know Mark IV engines had a bolt on canister with a valve, so if its going the wrong direction it could not get past the valve. That explains why my oil filter is luke warm. But how was oil getting to the engine when the valve stops it from returning because the flow was backwards?

Re: What actually happend when I reversed oil hoses??
 

The plumbing that was backwards was outside the Mark IV canister. You can plug both the inlet and outlet (basically your case) and the oil still exits the block in the normal place and goes through the bypass into the inlet side. It worked exactly as it should. The canister cant be bolted on backwards.
Gary

Re: What actually happend when I reversed oil hoses??
 

Robyw1 i think you summed it up!!

Re: What actually happend when I reversed oil hoses??
 

I had the same issue two summers ago and when I switched to a Fram filter oil pressure went to 10 lbs and even lower when the RPM's increased. Took the motor out once and put them on reversed again, and then when I had low pressure I know it had to be related to the cooler because primed outside on the stand and had good pressure. Bearing looked fine and I rode it like that out of spite, upset me enough that had the attitude if it blows it blows, well it didn't even with low pressure, never even scored a bearing.

Re: What actually happend when I reversed oil hoses??
 

perfect mix (josh, with 357 formula) just had this exact same problem this summer. newert engine in the boat from milennyum marine, plumbed the wrong inlet/outlet on the remote reservoir. spun a bearing,and needed a new engine. Lenny at miLennyum marine said this wrong routing starves engine at high rpm. but i personaly dont know the mechanics. proly as mentioned above.

this is rambunctious logged on waterfoul's account
ramb

Re: What actually happend when I reversed oil hoses??
 

Here is what happened to my starboard engine when the genius mechanic plumbed the oil lines in reverse..... :cool:

Re: What actually happend when I reversed oil hoses??
 

I personally don't know what planet some of these idiot mechanics fall off of... but oil does NOT pass through a paper element very fast... all spin on oil filter canisters have a bypass built in or they have a spring that allows the filter element to lift off it's base and the oil to pass that way. Some engines have a filter bypass built right into the engine because THE ENGINEERS KNOW THAT YOU CANNOT PASS ALL THE OIL THROUGH THE FILTER WITHOUT DECREASING FLOW.... so under high rpm's and cold oil conditions the oil MUST bypass the filter matrix. Plumb the filter backwards and you starve the bearings for oil. I learned this the hard way.

Re: What actually happend when I reversed oil hoses??
 

learned this the hard way too. plumbed backwards, good oil pressure according to gauge. motor was getting it's oil supply from the bypass.
ouch!!!

Re: What actually happend when I reversed oil hoses??
 

Thought I was the only one. It has been an embarrassing summer because I am the idiot mechanic that both plumbed the oil lines wrong and the idiot that had to buy another new short block after smoking the crank and bearings. Happened after 10 hrs, just when I thought I could hammer it, she puked. Good oil psi. bad flow. Expensive learning experience. Good luck

Josh

Re: What actually happend when I reversed oil hoses??
 

Even with my HP6s?