Low TJ oil pressure = new oil pump?
08-06-2006, 10:37 PM
#54
Guest
Posts: n/a
Re: Low TJ oil pressure = new oil pump?
I had that erratic drop problem and it turned out to be the thin paper
gasket between the pump housing and the block. Since it also had a
sticking pressure relief valve (ridge in the bore) I changed the pump
anyway. Don't forget to prime that sucker if you take it off - you
may never get oil pressure if you forget.
On Sun, 6 Aug 2006 17:43:29 UTC RalphDL@webtv.net (Ralph DL) wrote:
> 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.
>
--
Will Honea
gasket between the pump housing and the block. Since it also had a
sticking pressure relief valve (ridge in the bore) I changed the pump
anyway. Don't forget to prime that sucker if you take it off - you
may never get oil pressure if you forget.
On Sun, 6 Aug 2006 17:43:29 UTC RalphDL@webtv.net (Ralph DL) wrote:
> 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.
>
--
Will Honea
08-06-2006, 10:37 PM
#55
Guest
Posts: n/a
Re: Low TJ oil pressure = new oil pump?
I had that erratic drop problem and it turned out to be the thin paper
gasket between the pump housing and the block. Since it also had a
sticking pressure relief valve (ridge in the bore) I changed the pump
anyway. Don't forget to prime that sucker if you take it off - you
may never get oil pressure if you forget.
On Sun, 6 Aug 2006 17:43:29 UTC RalphDL@webtv.net (Ralph DL) wrote:
> 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.
>
--
Will Honea
gasket between the pump housing and the block. Since it also had a
sticking pressure relief valve (ridge in the bore) I changed the pump
anyway. Don't forget to prime that sucker if you take it off - you
may never get oil pressure if you forget.
On Sun, 6 Aug 2006 17:43:29 UTC RalphDL@webtv.net (Ralph DL) wrote:
> 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.
>
--
Will Honea
08-06-2006, 10:37 PM
#56
Guest
Posts: n/a
Re: Low TJ oil pressure = new oil pump?
I had that erratic drop problem and it turned out to be the thin paper
gasket between the pump housing and the block. Since it also had a
sticking pressure relief valve (ridge in the bore) I changed the pump
anyway. Don't forget to prime that sucker if you take it off - you
may never get oil pressure if you forget.
On Sun, 6 Aug 2006 17:43:29 UTC RalphDL@webtv.net (Ralph DL) wrote:
> 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.
>
--
Will Honea
gasket between the pump housing and the block. Since it also had a
sticking pressure relief valve (ridge in the bore) I changed the pump
anyway. Don't forget to prime that sucker if you take it off - you
may never get oil pressure if you forget.
On Sun, 6 Aug 2006 17:43:29 UTC RalphDL@webtv.net (Ralph DL) wrote:
> 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.
>
--
Will Honea
08-06-2006, 10:37 PM
#57
Guest
Posts: n/a
Re: Low TJ oil pressure = new oil pump?
I had that erratic drop problem and it turned out to be the thin paper
gasket between the pump housing and the block. Since it also had a
sticking pressure relief valve (ridge in the bore) I changed the pump
anyway. Don't forget to prime that sucker if you take it off - you
may never get oil pressure if you forget.
On Sun, 6 Aug 2006 17:43:29 UTC RalphDL@webtv.net (Ralph DL) wrote:
> 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.
>
--
Will Honea
gasket between the pump housing and the block. Since it also had a
sticking pressure relief valve (ridge in the bore) I changed the pump
anyway. Don't forget to prime that sucker if you take it off - you
may never get oil pressure if you forget.
On Sun, 6 Aug 2006 17:43:29 UTC RalphDL@webtv.net (Ralph DL) wrote:
> 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.
>
--
Will Honea
08-06-2006, 10:40 PM
#58
Guest
Posts: n/a
Re: Low TJ oil pressure = new oil pump?
On Sun, 06 Aug 2006 18:56:16 GMT, "Spdloader"
<askforit@nospam.triad.rr.com> wrote:
>
>
>> The pressure is "made" by the pump. Bearings is where it could be
>> "lost".
>>
>
>That's what I was saying, note the quotes around the word "made".
>
>Spdloader
>
Oh, I see. The quotes mean you were wrong on purpose. I guess I've
just never seen them used that way before...
<askforit@nospam.triad.rr.com> wrote:
>
>
>> The pressure is "made" by the pump. Bearings is where it could be
>> "lost".
>>
>
>That's what I was saying, note the quotes around the word "made".
>
>Spdloader
>
Oh, I see. The quotes mean you were wrong on purpose. I guess I've
just never seen them used that way before...
08-06-2006, 10:40 PM
#59
Guest
Posts: n/a
Re: Low TJ oil pressure = new oil pump?
On Sun, 06 Aug 2006 18:56:16 GMT, "Spdloader"
<askforit@nospam.triad.rr.com> wrote:
>
>
>> The pressure is "made" by the pump. Bearings is where it could be
>> "lost".
>>
>
>That's what I was saying, note the quotes around the word "made".
>
>Spdloader
>
Oh, I see. The quotes mean you were wrong on purpose. I guess I've
just never seen them used that way before...
<askforit@nospam.triad.rr.com> wrote:
>
>
>> The pressure is "made" by the pump. Bearings is where it could be
>> "lost".
>>
>
>That's what I was saying, note the quotes around the word "made".
>
>Spdloader
>
Oh, I see. The quotes mean you were wrong on purpose. I guess I've
just never seen them used that way before...
08-06-2006, 10:40 PM
#60
Guest
Posts: n/a
Re: Low TJ oil pressure = new oil pump?
On Sun, 06 Aug 2006 18:56:16 GMT, "Spdloader"
<askforit@nospam.triad.rr.com> wrote:
>
>
>> The pressure is "made" by the pump. Bearings is where it could be
>> "lost".
>>
>
>That's what I was saying, note the quotes around the word "made".
>
>Spdloader
>
Oh, I see. The quotes mean you were wrong on purpose. I guess I've
just never seen them used that way before...
<askforit@nospam.triad.rr.com> wrote:
>
>
>> The pressure is "made" by the pump. Bearings is where it could be
>> "lost".
>>
>
>That's what I was saying, note the quotes around the word "made".
>
>Spdloader
>
Oh, I see. The quotes mean you were wrong on purpose. I guess I've
just never seen them used that way before...
