In article <a8SdndrP4593SBveRVn_vQ@giganews.com>,
lid (fordltd) wrote:
> I've been trying to think of could be wrong w the ol ltd she seems to
> run good when I start her up and drive but after maybe 15 or 20 min.
> Of warming up her eng light comes on, am a little confused where to
> go from here have a oil pressure gauge and rpm gauge hooked up the
> oil pressure is good until it warms up it sits at about 2-3 psi while
> in idle and maybe 50-60 psi after start up right away, please
> somebody help! Any help is appreciated
OK I have to agree with those that have already responded the main and
rod bearings are probably toast and I also suspect it has the 351 M /
400 series engine. These were based off the poor oiling 351 C and also
were pourly oiled especially the 351 M far more so than the 400!
Maintenance of the 351 M is very important in the 3,000 mile range on
oil changes as these engines gum up if not properly maintained and the
poor oiling becomes No oiling and wipes the bearings. The reason you
have oil pressure on start up is the engine is cold once the oil warms
up the oil thins and you have the issue that you have.
I would try to change the oil first as well to see if that helps while
doing so check to see if there is any gas in the oil as the carbs of
this vintage dumped gas into the oil if the power valve stuck. Once the
oil mixes with the gas that will also wipe the bearings. If you
decide to fix it I would at least suggest at least changing the pump
screen and pump when changing the main and rod bearings (may need a
crank if this has been going on for a while)! Sorry but if it was mine
and you plan on keeping it I would pull it refresh the timing chain boil
the block and go straight through it completely!
Just my opinions hope they help