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Oil pump help

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Old 02-09-2020, 08:19 AM
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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.
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Old 02-09-2020, 08:22 AM
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Originally Posted by cruiser54
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.
So all that stuff in Post #4 is unnecessary?
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Old 02-09-2020, 08:37 AM
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Originally Posted by Ralph77
So all that stuff in Post #4 is unnecessary?
On a 4.0, yes.
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Old 02-09-2020, 12:58 PM
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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?
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Old 02-09-2020, 01:03 PM
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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.
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Old 02-09-2020, 01:15 PM
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Old 02-09-2020, 01:36 PM
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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"
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Old 02-09-2020, 02:38 PM
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Originally Posted by AlSpeciale
What do you mean by " turn it over a few times"

Who said that?

Go back and read my posts.
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Old 02-09-2020, 02:41 PM
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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.
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Old 02-09-2020, 02:51 PM
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Originally Posted by 97grand4.0
Uh oh.
Darn tootin'. Keep all the blue oval and bow-tie mumbo jumbo away from the 4.0.
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Old 02-09-2020, 03:03 PM
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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
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Old 02-09-2020, 03:04 PM
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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.
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Old 02-09-2020, 03:58 PM
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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?
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Old 02-09-2020, 04:29 PM
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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?
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Old 02-09-2020, 04:33 PM
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Originally Posted by awg
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?
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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