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 > General Truck Forums > Engine & Drivetrain > LSx Swaps

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-11-2021, 09:49 PM   #1
kev2809
low n' slo
 
kev2809's Avatar
 
Join Date: Mar 2009
Location: rosenberg, texas
Posts: 5,129
donor motor questions

the auction donor i bought (230k) didnt seem like the previous owner kept up well at all, has lot of leaks it seems and the temp gets to about 235 (low coolant light comes on, although it seems full, no coolant in oil.) im definitely changing knock sensors, intake gasket, valve cover gaskets and o rings, thermostat and housing and water pump (because of hot temps its reading), rear main seal, spark plugs and wires.

i own 2 of these ls trucks (2002 avalanche and a 2002 sierra), my sierra has just hit 200k and always reads 60 psi at idle. my avalanche always reads 40 psi, as does my new donor truck. is this a concern or should i also add an oil pump to the list? i REALLY didnt plan to do all this, but i dont like these oil leaks so its a must. knock sensors is just prev. maintenance (changed them on my sierra not long ago), and obviously the thermo and water pump due to apparent over heating. so now this oil pump has come to mind, and i know the timing chain is right there too...........where should it end?? lol
__________________
67 1/2 ton Suburban - Project DRGNWGN. Build thread

-_--_--_ _________
_--_-_ -/____|__|__\__
,.,,,.,.,,.,|_O _______ O_]
kev2809 is offline   Reply With Quote
Old 01-11-2021, 10:08 PM   #2
mongocanfly
Post Whore

 
mongocanfly's Avatar
 
Join Date: May 2015
Location: Alabama
Posts: 14,557
Re: donor motor questions

Have you done a compression and leak down test?..
__________________
Mongo...aka Greg

RIP Dad
RIP Jesse

1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598
Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334
Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563
2023 Chevy Z71..daily driver
mongocanfly is offline   Reply With Quote
Old 01-12-2021, 12:16 AM   #3
kev2809
low n' slo
 
kev2809's Avatar
 
Join Date: Mar 2009
Location: rosenberg, texas
Posts: 5,129
Re: donor motor questions

Quote:
Originally Posted by mongocanfly View Post
Have you done a compression and leak down test?..
nope it runs pretty good though and doesnt smoke...i even drove it about 10 miles back to my house
__________________
67 1/2 ton Suburban - Project DRGNWGN. Build thread

-_--_--_ _________
_--_-_ -/____|__|__\__
,.,,,.,.,,.,|_O _______ O_]
kev2809 is offline   Reply With Quote
Old 01-12-2021, 12:58 AM   #4
EVRLET
Registered User
 
EVRLET's Avatar
 
Join Date: Aug 2015
Location: Las Vegas NV
Posts: 354
Re: donor motor questions

I think you answered your own question. You said the motor wasn’t kept up well. You’re going through the motor and changing things, so an oil pump is good insurance plus easier to change with the motor out. You mentioned o-rings, so I’m assuming you mean the pick up tube o-ring. If that’s not what you meant, add it to your list.
__________________
Customization is what you want it to look like -- not what other people think it should look like
EVRLET is offline   Reply With Quote
Old 01-12-2021, 07:39 AM   #5
kev2809
low n' slo
 
kev2809's Avatar
 
Join Date: Mar 2009
Location: rosenberg, texas
Posts: 5,129
Re: donor motor questions

Quote:
Originally Posted by EVRLET View Post
I think you answered your own question. You said the motor wasn’t kept up well. You’re going through the motor and changing things, so an oil pump is good insurance plus easier to change with the motor out. You mentioned o-rings, so I’m assuming you mean the pick up tube o-ring. If that’s not what you meant, add it to your list.
meant the grommets in the valve covers, but i have a new pan with the swap that comes with new pickup tube and o ring, so thats already getting change. i don't mind changing the pump, but im unsure on the timing chain. they seem a little scary to mess with
__________________
67 1/2 ton Suburban - Project DRGNWGN. Build thread

-_--_--_ _________
_--_-_ -/____|__|__\__
,.,,,.,.,,.,|_O _______ O_]
kev2809 is offline   Reply With Quote
Old 01-12-2021, 05:54 PM   #6
LS short box
Registered User
 
Join Date: Jun 2015
Location: Carlos MN
Posts: 1,888
Re: donor motor questions

Timing chain is no big deal. Just line up the timing marks, unbolt the cam sprocket and put the new chain on. Use loctite on the cam bolts.
LS short box is online now   Reply With Quote
Old 01-12-2021, 07:22 PM   #7
AussieinNC
Moderator
 
AussieinNC's Avatar
 
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,152
Re: donor motor questions

To make it easier to change the timing chain, back off all the rockers to lesseb the load on the lifters/cam....

As mentioned, changing the chain is not a big job, especially when you have it apart to the extent you have listed.

While you have it apart, suggest you pull the rear seal housing and swap out the barbell ...its in a port in rear of engine and seals off the oil flow out of the filter into the engine....

See this video on youtube

https://www.youtube.com/watch?v=4Hi9XMQ1S_4

Remember to clearance the oil pump when installing it....

__________________
Family and country before all others...

2006 Chevy Silverado (Daily Driver)
2012 Chevy Equinox

AussieinNC is offline   Reply With Quote
Old 01-13-2021, 01:25 AM   #8
truckdude239
Senior Member
 
truckdude239's Avatar
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,216
Re: donor motor questions

I 2ouldnt worry about oil pump my tahoe had 369k when trans went with the previous owner they gave it to me it still had 40 pounds of oil pressure at idle weekend though it leaked oil faster then u could pour in it got a 150k motor and trans put in
__________________
David fuller
Ase Certified Mechanic
Click here to help support our board!!


1971 Chevy c-10 under going a 4.8l LSx swap

Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305

2007 Honda Accord my daily 145kmiles
2002 Honda Accord 4 door With 330k(sisters car)
2005 toyota Avalon 228k( brothers car)
2002 Sububran 5.3 245k
2000 Tahoe 5.3l 378

General manager for Marco's Carwash & lube
truckdude239 is offline   Reply With Quote
Old 01-14-2021, 09:49 PM   #9
kev2809
low n' slo
 
kev2809's Avatar
 
Join Date: Mar 2009
Location: rosenberg, texas
Posts: 5,129
Re: donor motor questions

Quote:
Originally Posted by truckdude239 View Post
I 2ouldnt worry about oil pump my tahoe had 369k when trans went with the previous owner they gave it to me it still had 40 pounds of oil pressure at idle weekend though it leaked oil faster then u could pour in it got a 150k motor and trans put in
oil pump is another 60 bucks from rockauto. so far my total is 370 before shipping and taxes lol. wasnt planning on this at all
__________________
67 1/2 ton Suburban - Project DRGNWGN. Build thread

-_--_--_ _________
_--_-_ -/____|__|__\__
,.,,,.,.,,.,|_O _______ O_]
kev2809 is offline   Reply With Quote
Old 10-27-2021, 02:35 PM   #10
kev2809
low n' slo
 
kev2809's Avatar
 
Join Date: Mar 2009
Location: rosenberg, texas
Posts: 5,129
Re: donor motor questions

revisiting this! i sold my donor truck and drivetrain...it ended up having water in the oil...guessing blown head gasket. but i did pick up another truck. this one is a 2002 tahoe...dash says 211k. just rolled it in over the weekend and will be tearing it down this week. this one looks very well kept up with..the inside of this truck is immaculant. an older gentleman owned this one.

but anywho, im kind of in the same boat again! my parts list added up quickly..

Valve cover gaskets and grommets
Intake gasket
valley cover gasket
knock sensors and harness
Rear main seal
Rear cover gasket
Oil galley barbel
Timing chain
Front cover gasket and seal
Oil pump
water pump and gaskets
thermostat
spark plugs and wire set

Total from rockauto is 485 shipped (oreilley was about 740). this engine doesnt have near the grime the other one does. but i have to pull the intake to get my engine puller plate on. rear main is a given imo since its hard to get to in the truck. but the front stuff is what im not sure about. none of the front needs to come off unless i just want to change stuff out. already have headers and new oil pan so those are getting new gaskets as well.

i think i know the response on this....but what your opinions? im dead set on the rear seals, but is everything up front really needed to change?
__________________
67 1/2 ton Suburban - Project DRGNWGN. Build thread

-_--_--_ _________
_--_-_ -/____|__|__\__
,.,,,.,.,,.,|_O _______ O_]
kev2809 is offline   Reply With Quote
Old 10-27-2021, 07:21 PM   #11
ls1nova71
Registered User
 
ls1nova71's Avatar
 
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,117
Re: donor motor questions

This is what I would do, but it's only my personal opinion.

Valve cover gaskets and grommets If they're not leaking, leave them alone
Intake gasket Yes, especially if you're pulling the intake
valley cover gasket No
knock sensors and harness Only if they look bad or if the wiring looks bad
Rear main seal You're doing this anyway
Rear cover gasket Only if it's leaking
Oil galley barbel If the truck has good oil pressure, no
Timing chain This one's a crap shoot, ask yourself, honestly, how many miles do you think you will put on the truck when done? If just a cruiser for the weekend, then I wouldn't worry about it
Front cover gasket and seal If it's not leaking, then no, but do if you change the chain.
Oil pump If it has good oil pressure, then my response is the same as the chain.
water pump and gaskets Gaskets if you remove the pump for any reason. But if it isn't leaking, no. Odds are it isn't the original pump anyway, and they are easy to change later if need be.
thermostat Same as water pump
spark plugs and wire set Look at them and see their condition. Again, odds are they aren't original either, and are easy to change later too.
__________________
My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html

5.3 swap into my RUSTY '71 C10
http://ls1tech.com/forums/conversion...71-c-10-a.html
ls1nova71 is offline   Reply With Quote
Old 10-27-2021, 07:58 PM   #12
kev2809
low n' slo
 
kev2809's Avatar
 
Join Date: Mar 2009
Location: rosenberg, texas
Posts: 5,129
Re: donor motor questions

good points. I will know a little more when I get it out. someone has already changed the intake gasket, and I'm guessing knock sensors since there is a bead of RTV around to deflect the water. valve covers were only mentioned because I might paint them. spark plugs and wires were really just for tune up purposes. rear main...well that's obvious. sure as hell don't want to change that later down the road.

this truck will not be a daily, just a cruiser every now and then
__________________
67 1/2 ton Suburban - Project DRGNWGN. Build thread

-_--_--_ _________
_--_-_ -/____|__|__\__
,.,,,.,.,,.,|_O _______ O_]
kev2809 is offline   Reply With Quote
Old 10-27-2021, 08:43 PM   #13
LS short box
Registered User
 
Join Date: Jun 2015
Location: Carlos MN
Posts: 1,888
Re: donor motor questions

I would replace the crank sensor only because its really a pain to get at once you bolt on the starter and right hand exhaust manifold.
LS short box is online now   Reply With Quote
Old 10-30-2021, 07:08 AM   #14
Acregger
Registered User
 
Join Date: Jul 2020
Location: Pennsylvania
Posts: 54
Re: donor motor questions

My donor has 220000 on it and I thought the same as you Kev I resealed it and wanted to replace the oil pump and chain as it is very easy on the stand but I can tell you cost me a little more because then I figured might as well do a cam swap so a heads up it could wind up costing more then you figured. But I am happy I did
Acregger is offline   Reply With Quote
Old 10-30-2021, 12:20 PM   #15
kev2809
low n' slo
 
kev2809's Avatar
 
Join Date: Mar 2009
Location: rosenberg, texas
Posts: 5,129
Re: donor motor questions

lol that's my fear. but I'm just ready to get this truck done. snowballing and dis interest has kept it from being finished a loooong time ago. right now I'm leaning towards the top stuff and of course the rear stuff. think I'm leaving the front components alone. hope to have it pulled tomorrow
__________________
67 1/2 ton Suburban - Project DRGNWGN. Build thread

-_--_--_ _________
_--_-_ -/____|__|__\__
,.,,,.,.,,.,|_O _______ O_]
kev2809 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 05:38 PM.


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