Oil pump help

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Feb 9, 2020 | 08:19 AM

#16

cruiser54

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Joined: Aug 2011

Posts: 43,971

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by Ralph77

To be frank with you not a clue. Been meaning to ask my friend about this.
Been reading these threads lately.
Most of it is here:

https://www.cherokeeforum.com/f67/3-...ng-oil-255577/

I would never suggest that thread to anyone regarding proper engine building.

If you want to learn beforehand, peruse the FSM to see how easy these engines are compared to Detroit Iron. too many myths are applied to the 4.0 that they don't deserve.

Feb 9, 2020 | 08:22 AM

#17

Ralph77

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Joined: Oct 2015

Posts: 7,517

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Year: 2000

Model: Cherokee (XJ)

Quote:

Originally Posted by cruiser54

So all that stuff in Post #4 is unnecessary?

Feb 9, 2020 | 08:37 AM

#18

cruiser54

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Joined: Aug 2011

Posts: 43,971

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by Ralph77

So all that stuff in Post #4 is unnecessary?

On a 4.0, yes.

Feb 9, 2020 | 12:58 PM

#19

AlSpeciale

Thread Starter

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Joined: Dec 2019

Posts: 257

Likes: 11

From: Los Angeles

Year: 1992

Model: Cherokee (XJ)

Quote:

Originally Posted by Ralph77

Just disconnect the Crank Positioning sensor huh.
Easy peasy huh. Thanks for that.
Been thinking about building an engine, well really my friend will handle most of the heavy lifting but I will be involved, and been trying to educate myself about pre-oiling an engine and
all the preload stuff with rocker/lifters/whatnot I have been reading about lately.

where is the crank positioning sensor . Got a picture?

Feb 9, 2020 | 01:03 PM

#20

Ralph77

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Joined: Oct 2015

Posts: 7,517

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Year: 2000

Model: Cherokee (XJ)

Quote:

Originally Posted by AlSpeciale

where is the crank positioning sensor . Got a picture?

Picture no. The connector for it in my '00 is on driver's side near some shifter linkage.
The CPS is on top of the bellhousing more accessible from the same side.

Feb 9, 2020 | 01:15 PM

#21

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,578

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Feb 9, 2020 | 01:36 PM

#22

AlSpeciale

Thread Starter

Seasoned Member

Joined: Dec 2019

Posts: 257

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From: Los Angeles

Year: 1992

Model: Cherokee (XJ)

Quote:

Originally Posted by Ralph77

Picture no. The connector for it in my '00 is on driver's side near some shifter linkage.
The CPS is on top of the bellhousing more accessible from the same side.

What do you mean by " turn it over a few times"

Feb 9, 2020 | 02:38 PM

#23

cruiser54

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Joined: Aug 2011

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by AlSpeciale

What do you mean by " turn it over a few times"

Who said that?

Go back and read my posts.

Feb 9, 2020 | 02:41 PM

#24

97grand4.0

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Joined: Nov 2015

Posts: 2,856

Likes: 201

From: syracuse ny

Year: 1997

Model: Grand Cherokee (ZJ)

Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims

Quote:

Originally Posted by cruiser54

What preload? You just torque them down.

Everyone needs to quit comparing these wonderfully easy engines to Fords and Chevys.

Uh oh.

Feb 9, 2020 | 02:51 PM

#25

cruiser54

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Joined: Aug 2011

Posts: 43,971

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by 97grand4.0

Uh oh.

Darn tootin'. Keep all the blue oval and bow-tie mumbo jumbo away from the 4.0.

Feb 9, 2020 | 03:03 PM

#26

AlSpeciale

Thread Starter

Seasoned Member

Joined: Dec 2019

Posts: 257

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From: Los Angeles

Year: 1992

Model: Cherokee (XJ)

Quote:

Originally Posted by cruiser54

Who said that?

Go back and read my posts.

my bad. I meant "crank the engine over". What does that mean? And how do I disconnect the CPS

Feb 9, 2020 | 03:04 PM

#27

97grand4.0

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Joined: Nov 2015

Posts: 2,856

Likes: 201

From: syracuse ny

Year: 1997

Model: Grand Cherokee (ZJ)

Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims

So much for Dave nominating my post for a sticky then. But I fail to see how these lifters aren't affected by preload. CCKen seemed to think so also.

Feb 9, 2020 | 03:58 PM

#28

cruiser54

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Joined: Aug 2011

Posts: 43,971

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by AlSpeciale

my bad. I meant "crank the engine over". What does that mean? And how do I disconnect the CPS

Are you serious?

Feb 9, 2020 | 04:29 PM

#29

awg

CF Veteran

Joined: Mar 2016

Posts: 3,816

Likes: 725

Year: 96

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by cruiser54

Waste of time and $. It's not a Chevy. Oil pump failure is very uncommon in the 4.0 and the cheapo off shore built replacement pump likely isn't as good as the one that's in there.

I personally cannot see any reason to fit a HV pump in motors that routinely last +200k miles

My question would arise at what point you would not re-use the old one, but obtain a new pump (in a rebuild or major overhaul).

I presume an OEM oil pump is no longer available?

Feb 9, 2020 | 04:33 PM

#30

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,578

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by awg

I don't know if the OEMs are available or not. Aftermarket, with POSSIBLY the exception being Melling, are likely off shore junk made of inferior materials and sketchy engineering.

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