The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-23-2013, 12:28 PM   #1
Thetuneman
Registered User
 
Join Date: Jan 2013
Location: Harrah OK
Posts: 9
83 pickup 305

Want to change out oil pump om my 83 custom Chevy 305. Do I need to undo the motor mounts and raise motor to get the pan off in order change it out? Or can I get the pan off without raising the motor?
Thetuneman is offline   Reply With Quote
Old 01-23-2013, 01:14 PM   #2
SSC's76
No No
 
SSC's76's Avatar
 
Join Date: Jun 2005
Location: Pueblo Colorado
Posts: 1,781
you should be able to slide it out with out having to loosen the motor mounts. its a very tight fit on a 2wd but the pan will come out. if you have 4x4 then its a piece of cake


Posted from 67-72chevytrucks.com App for Android
__________________
1976 Custom Deluxe SWB Med FMB.3/4 Drop.
Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out.
1997 K1500 ext cab 5.7 stock except muffler
SSC's76 is offline   Reply With Quote
Old 01-23-2013, 03:05 PM   #3
gchemist
BAD BOW-Silverado XST
 
gchemist's Avatar
 
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
Re: 83 pickup 305

Welcome to the site.
Why do you need to replace the oil pump? They are practically fail proof. If your oil pressure is low, change the sending unit. Over time they do get clogged inside. Poor grounding can also cause poor readings. The sensor should have nothing on the threads. The block should be grounded the frame rail or battery.
__________________
Gerardo a.k.a. Mad Chemist
Silverado XST videos
gchemist is offline   Reply With Quote
Old 01-23-2013, 03:46 PM   #4
Thetuneman
Registered User
 
Join Date: Jan 2013
Location: Harrah OK
Posts: 9
Re: 83 pickup 305

Just thought I would, because I'm changing out timing gear and chain , water pump and balancer. Balancer was bad, "wobbling".
The truck sat for a few years, had some leaks. When I took it apart , the chain was really loose. Just thought I would do preventive maintenence on it while I was at it.
Oil pressure gauge is mechanical now as is temp. Runs about 5-10 lbs at idle, and 30 at highway speed. Was going to put a performance oil pump on it to get better pressure. Maybe I really don't need it.
Thetuneman is offline   Reply With Quote
Old 01-23-2013, 05:00 PM   #5
kalbert
Registered User
 
Join Date: Jun 2012
Location: Minnesota
Posts: 509
Re: 83 pickup 305

Nah.. I'd say it's alot of work for nothing probably. 5-10 at idle is typical for an older motor, 30 at speed is just fine. A performance pump may or may not improve that. Although if you're going to have the pan off anyway to get the front cover off it isn't that much more work to stick another pump on too.
kalbert is offline   Reply With Quote
Old 01-23-2013, 05:01 PM   #6
Ziegelsteinfaust
Registered User
 
Join Date: Dec 2012
Location: Temple City
Posts: 3,554
Re: 83 pickup 305

Low oil pressure is almost always due to the bearing clearances, but it wouldn't be unheard of for an oil pump to go bad.

Plus if you add a high volume oil pump to a worn engine you have the potential pump up all the oil to the top if you lose a quart of oil or if your oil return drains are a touch clogged.

I would do the gaskets, and chain then drive it while it lasts. From what I read, and desk top trouble shooting is like tossing it against the wall till something sticks.

So I would save for a newer motor or grab one to rebuild out of pick a part. That way you can detail the whole thing before it goes in, and upgrade it at the same time. Complete vortec 350's go for $300 complete at the pick a parts where I live, and it'll be a worth while upgrade. Or if your lucking find a wrecked truck, and pull the head to see the ring wear. The a refresh or just gaskets maybe all she needs.
Ziegelsteinfaust is offline   Reply With Quote
Old 01-23-2013, 05:05 PM   #7
Thetuneman
Registered User
 
Join Date: Jan 2013
Location: Harrah OK
Posts: 9
Re: 83 pickup 305

OK! Thanks! Really didn't want to pull the pan anyway. Took the front cover off easily without loosening the pan , but I'm sure I'll fight it some going back on.
Thetuneman is offline   Reply With Quote
Old 01-23-2013, 05:50 PM   #8
kalbert
Registered User
 
Join Date: Jun 2012
Location: Minnesota
Posts: 509
Re: 83 pickup 305

Quote:
Originally Posted by Thetuneman View Post
OK! Thanks! Really didn't want to pull the pan anyway. Took the front cover off easily without loosening the pan , but I'm sure I'll fight it some going back on.
You probably won't get the cover on without loosening the pan, it will be insanely difficult to get the gasket and everything stuffed in without. I did manage to get one back on without, but it leaked a steady stream of oil so it had to come apart anyway.
kalbert is offline   Reply With Quote
Old 01-23-2013, 06:18 PM   #9
gchemist
BAD BOW-Silverado XST
 
gchemist's Avatar
 
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
Re: 83 pickup 305

Good work on saving the 305. Mine blew up due to a failed timing chain gear. The failure broke the cam in half. Great 305. Overheated twice. Once to 280! Fixed the coolant leak, changed the oil and ran it until it blew up. Now my truck has a ZZ4.
__________________
Gerardo a.k.a. Mad Chemist
Silverado XST videos
gchemist is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 03:02 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com