Low Oil Pressure Root Causes??
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New User
Joined: Jun 2010
Posts: 24
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From: Falls City, OR
Low Oil Pressure Root Causes??
I am still a newbie when it comes to the 335 series engines and am learning a lot from everyone here. With that in mind forgive me for the long post.
I too am suffering from low oil pressure and have been reading about possible causes and fixes to the issue. I recently read a post which mentioned crank itself is not hardened properly which leads elongation of the journals which leads to premature bearing wear which creates or adds to the low oil pressure. This makes some sense since bearing wear is also a common issue.
So my questions become...Has anybody researched the improper hardening/heat treating of the crank? Could this be a root cause to the oil pressure problem? Or am I just grasping?
I too am suffering from low oil pressure and have been reading about possible causes and fixes to the issue. I recently read a post which mentioned crank itself is not hardened properly which leads elongation of the journals which leads to premature bearing wear which creates or adds to the low oil pressure. This makes some sense since bearing wear is also a common issue.
So my questions become...Has anybody researched the improper hardening/heat treating of the crank? Could this be a root cause to the oil pressure problem? Or am I just grasping?
Laughing Gas
Joined: Nov 2003
Posts: 898
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From: southeren Oh
I am still a newbie when it comes to the 335 series engines and am learning a lot from everyone here. With that in mind forgive me for the long post.
I too am suffering from low oil pressure and have been reading about possible causes and fixes to the issue. I recently read a post which mentioned crank itself is not hardened properly which leads elongation of the journals which leads to premature bearing wear which creates or adds to the low oil pressure. This makes some sense since bearing wear is also a common issue.
So my questions become...Has anybody researched the improper hardening/heat treating of the crank? Could this be a root cause to the oil pressure problem? Or am I just grasping?
I too am suffering from low oil pressure and have been reading about possible causes and fixes to the issue. I recently read a post which mentioned crank itself is not hardened properly which leads elongation of the journals which leads to premature bearing wear which creates or adds to the low oil pressure. This makes some sense since bearing wear is also a common issue.
So my questions become...Has anybody researched the improper hardening/heat treating of the crank? Could this be a root cause to the oil pressure problem? Or am I just grasping?
I'd drop the oil pan and have a look at the situation. You might just have a fix with a set of bearing and a pump.
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New User
Joined: Jun 2010
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From: Falls City, OR
Right now I am trying to push mine another 30K+/- miles before I rebuild. Just want to ensure I'm not putting money in the wrong areas as I go along. Lucky for me I have a neighbor that is a retired mechanic of 30 some years; along with everyone here I am confident.
Posting Guru
Joined: Nov 2008
Posts: 1,937
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From: wyoming
another scenerio!
oil pump? On the impellar clearance inside oil pump. Check your clearance with a depth mic. See how much clearance from btm plate to impellar. Or just depth mic top of housing to top of impellar housing. Probably needs to be around .002/.003 clearance. If more your gonna get some bypass internal of pump. Not many people check this but just some more stuff to keep you up at night. Here lately my faith in quality control isn't good. so I check everything these days when building motors. catch you later. On your original question usually your bearing clearance is usually the problem or like mentioned is questionable machining. another problem is getting a filter that doesn't have a internal bypass. If it bypasses internal on filter it allows dirt and debris to enter your bearings. this is a big problem in cold weather climate when oil is thick and creates higher oil pressures at start up. just more stuff to lose sleep over.
Posting Guru
Joined: Nov 2008
Posts: 1,937
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From: wyoming
oil pump stuff!
forgot to mention if your oil pump has .005 clearance or more at impellar and your bearing clearance is .003. Your gonna have a oil pressure issue because your clearance in pump is greater than your bearing so it forces your pump to bypass internal to a point. The hotter your oil gets the easier it is to bypass. just more stuff to keep you up hope this helps you lose sleep, ha! ha!
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Senior User
Joined: Jan 2008
Posts: 427
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From: Irondale, Al.
I had the same issue with low oil pressure before my 351M engine was rebuilt. The mains and rod bearings in my engine were in great shape considering it had over 205,000 miles on it. The problem was the cam bearings were shot. Some had very little bearing surface material left. So, this was the problem with the low oil pressure, particularly at idle.
Wyoming is correct about oil pumps, never assume a new oil pump has the correct clearances right out of the box, you may regret not checking.
My engine builder checks every pump before it's bolted on.
Wyoming is correct about oil pumps, never assume a new oil pump has the correct clearances right out of the box, you may regret not checking.
My engine builder checks every pump before it's bolted on.
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Posting Guru
Joined: Nov 2008
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From: wyoming
hey smokey, cam bearings?
I just recently purchased some cam bearings from tim meyer. This is the cam bearings with the groove on back side. with this little upgrade to bearing you can clock lube hole to the 3 o'clock position. Get a restrictor built into the bearing, scary simple idea. don't have to drill tap block to upgrade. great little feature for the regular guys like us. I like scary simple!! Gonna have to get new bearings when rebuilding so might as well get the good ones. Haven't completed this engine yet but all the pieces of the puzzle are coming together.
Senior User
Joined: Jan 2008
Posts: 427
Likes: 1
From: Irondale, Al.
I just recently purchased some cam bearings from tim meyer. This is the cam bearings with the groove on back side. with this little upgrade to bearing you can clock lube hole to the 3 o'clock position. Get a restrictor built into the bearing, scary simple idea. don't have to drill tap block to upgrade. great little feature for the regular guys like us. I like scary simple!! Gonna have to get new bearings when rebuilding so might as well get the good ones. Haven't completed this engine yet but all the pieces of the puzzle are coming together.
Posting Guru
Joined: Nov 2008
Posts: 1,937
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From: wyoming
yeah its a durabond but?
yeah its a durabond bearing but has a number written on box with marker and forgot the number. Its at the shop will get it later this week. tim meyer is a smarty pants with these fords. catch you later!
Senior User
Joined: Feb 2009
Posts: 308
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From: Southern NM
Excessive gear lash is not the only thing that can create problems with the pump.The output of the pump is regulated,and if you have a weak spring,or a regulating bypass valve worn or stuck in the open position,you will have marginal pressure.
Posting Guru
Joined: Nov 2008
Posts: 1,937
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From: wyoming
oil pump stuff!
Had to set clearance on some dodges because the plate to impellar was at .006 and took it down to .0025. had to do this with fine sand paper on glass to try and keep even. had to sand by hand not the approved technique but will work with depth mic. Eventually got it to the spec I wanted and all was good to go. don't assume they got it right at the factory. Just things I've learned along the way.
Senior User
Joined: Feb 2009
Posts: 308
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From: Southern NM
The OP doesn't mention mileage on this engine but,probably safe to consider it has many miles.I agree with Mark about the sloppy clearances.They were not great when the engine was new.The OP, without a doubt has some machine work in his future.
