Re: Low TJ oil pressure = new oil pump?
 

Earl Horton;

Which bearimgs might be worn out?... in the pump?... camshaft?... ?

Ralph

God exists, or God does not exist, or I am God and I am dreaming all
this.

Re: Low TJ oil pressure = new oil pump?
 

Earl Horton;

Which bearimgs might be worn out?... in the pump?... camshaft?... ?

Ralph

God exists, or God does not exist, or I am God and I am dreaming all
this.

Re: Low TJ oil pressure = new oil pump?
 

Earl Horton;

Which bearimgs might be worn out?... in the pump?... camshaft?... ?

Ralph

God exists, or God does not exist, or I am God and I am dreaming all
this.

Re: Low TJ oil pressure = new oil pump?
 

Bill ------

Thanks for the schematic... that helps my understanding of the TJ's pump
operation... seems typical for engines.

Over the past 56 years I've had many cars... starting with a 40 Hudson,
33,34,36,37,38,41,67,73 Fords, 47,49,53 Lincolns, 41 Plymouth,
49,49,51,47,65,80,86,97,51 Jeeps, 65,67 Scouts, 65,73 Chevies, 88 Dodge,
and none ever had oil pump failures. I just don't get it.

If the camshaft turns a "jackshaft" which drives the pump, can worn
bearings be the culprit? The pressure does not always drop when the
engine is at idle... I'd guess only about a third of the times when the
engine speed drops to idle... most of the time it drops to about 20-25.

It NEVER drops at road speeds... city or highway.

Ralph



God exists, or God does not exist, or I am God and I am dreaming all
this.

Re: Low TJ oil pressure = new oil pump?
 

Bill ------

Thanks for the schematic... that helps my understanding of the TJ's pump
operation... seems typical for engines.

Over the past 56 years I've had many cars... starting with a 40 Hudson,
33,34,36,37,38,41,67,73 Fords, 47,49,53 Lincolns, 41 Plymouth,
49,49,51,47,65,80,86,97,51 Jeeps, 65,67 Scouts, 65,73 Chevies, 88 Dodge,
and none ever had oil pump failures. I just don't get it.

If the camshaft turns a "jackshaft" which drives the pump, can worn
bearings be the culprit? The pressure does not always drop when the
engine is at idle... I'd guess only about a third of the times when the
engine speed drops to idle... most of the time it drops to about 20-25.

It NEVER drops at road speeds... city or highway.

Ralph



God exists, or God does not exist, or I am God and I am dreaming all
this.

Re: Low TJ oil pressure = new oil pump?
 

Bill ------

Thanks for the schematic... that helps my understanding of the TJ's pump
operation... seems typical for engines.

Over the past 56 years I've had many cars... starting with a 40 Hudson,
33,34,36,37,38,41,67,73 Fords, 47,49,53 Lincolns, 41 Plymouth,
49,49,51,47,65,80,86,97,51 Jeeps, 65,67 Scouts, 65,73 Chevies, 88 Dodge,
and none ever had oil pump failures. I just don't get it.

If the camshaft turns a "jackshaft" which drives the pump, can worn
bearings be the culprit? The pressure does not always drop when the
engine is at idle... I'd guess only about a third of the times when the
engine speed drops to idle... most of the time it drops to about 20-25.

It NEVER drops at road speeds... city or highway.

Ralph



God exists, or God does not exist, or I am God and I am dreaming all
this.

Re: Low TJ oil pressure = new oil pump?
 

Bill ------

Thanks for the schematic... that helps my understanding of the TJ's pump
operation... seems typical for engines.

Over the past 56 years I've had many cars... starting with a 40 Hudson,
33,34,36,37,38,41,67,73 Fords, 47,49,53 Lincolns, 41 Plymouth,
49,49,51,47,65,80,86,97,51 Jeeps, 65,67 Scouts, 65,73 Chevies, 88 Dodge,
and none ever had oil pump failures. I just don't get it.

If the camshaft turns a "jackshaft" which drives the pump, can worn
bearings be the culprit? The pressure does not always drop when the
engine is at idle... I'd guess only about a third of the times when the
engine speed drops to idle... most of the time it drops to about 20-25.

It NEVER drops at road speeds... city or highway.

Ralph



God exists, or God does not exist, or I am God and I am dreaming all
this.

Re: Low TJ oil pressure = new oil pump?
 

My wife's '97 with a 2.5 has EXACTLY the same problem.

It would drop so low that at idle, the check gauges lights and all would
come on.

I currently use straight 40wt oil in it to keep the pressure up. Don't know
what I'll do when winter comes.

It started around 62,000 miles. It now has around 68,000 on it.

No other symptoms or noises.

It would really shock me if cam or crank bearings were worn out at this low
mileage, but that is where the pressure is "made".

Spdloader

Re: Low TJ oil pressure = new oil pump?
 

My wife's '97 with a 2.5 has EXACTLY the same problem.

It would drop so low that at idle, the check gauges lights and all would
come on.

I currently use straight 40wt oil in it to keep the pressure up. Don't know
what I'll do when winter comes.

It started around 62,000 miles. It now has around 68,000 on it.

No other symptoms or noises.

It would really shock me if cam or crank bearings were worn out at this low
mileage, but that is where the pressure is "made".

Spdloader

Re: Low TJ oil pressure = new oil pump?
 

My wife's '97 with a 2.5 has EXACTLY the same problem.

It would drop so low that at idle, the check gauges lights and all would
come on.

I currently use straight 40wt oil in it to keep the pressure up. Don't know
what I'll do when winter comes.

It started around 62,000 miles. It now has around 68,000 on it.

No other symptoms or noises.

It would really shock me if cam or crank bearings were worn out at this low
mileage, but that is where the pressure is "made".

Spdloader