Top end 5.3 please advise - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RestoreAmerica · 10-08-2016, 06:27 PM

Hello,
I am a 67-72 Die Hard.
I recently picked up a 2000 Yukon with a 5.3 and posted in that forum.
Very little response or activity. Obviously a gear head is a gear head. I am just looking for input.
Here is what I posted.

Hello,
I acquired this vehicle and it appear to be worth fixing.

Bad head or gasket. I just ordered a set of remanufactured heads.

While I have this torn apart, what else should I do to the motor.

Vehicle had noisy lifters but also had bad head gasket or cracked head.

I don't want to spend more than needed but don't want to tear it apart in 6 months to replace something I could easily replace now.

I have not gotten the heads off yet. Almost there. I decided better just purchase heads for $300 than to just put gaskets on the old ones. These are the head I purchased http://www.ebay.com/itm/201358045312...%3AMEBIDX%3AIT

Would you replace the lifters or just clean them?

Any advice is appreciated.

Thank you!!

indymachinist · 10-08-2016, 07:52 PM

Replace lifters and lifter trays.

RestoreAmerica · 10-08-2016, 07:58 PM

What about the knock sensors?

Dustytrix · 10-08-2016, 09:25 PM

You can get to the knock sensors easy when the go bad. I would leave them alone until then.

**special-K** · 10-08-2016, 09:47 PM

What's a knock sensor?

Have you tried your question in the LS swap forum? It may be for swaps but that is what you have and at least that is a place that is related to LS engines. Lots of action here, but it is for topics specific to 67-72 trucks

LeesTruk · 10-09-2016, 06:08 AM

The knock sensors do not live in an air tight environment and are susceptible to water intrusion and do corrode. When you pull the intake off, take a look at them and then decide. Change the knock sensor harness as well, if the sensors are corroded. The parts are readily available at most parts stores, and not cost prohibitive. Most likely, the sensor seals will have hardened and should be replaced if you pull the sensors

If you need a hand, I live just up the road in Manchester. Shoot me a PM if you need assistence

RestoreAmerica · 10-09-2016, 07:43 AM

I purchased lifters and trays, push rods, knock sensor, and the wiring harness that goes with knock sensor.

Would anyone consider soaking the intake and TBI in kerosene, diesel, or some other type of solution to clean it?

Big Port Jimmy 6 · 10-09-2016, 05:11 PM

Quote:

Originally Posted by RestoreAmerica

I purchased lifters and trays, push rods, knock sensor, and the wiring harness that goes with knock sensor.

Would anyone consider soaking the intake and TBI in kerosene, diesel, or some other type of solution to clean it?

I immersed mine in dawn dish detergent and hot water in a trash can. Followed that with a rinse and purple power and it was clean.

RestoreAmerica · 10-09-2016, 07:11 PM

Quote:

Originally Posted by Big Port Jimmy 6

I immersed mine in dawn dish detergent and hot water in a trash can. Followed that with a rinse and purple power and it was clean.

The entire manifold with fuel injectors and everything?

Willie Makeit · 10-09-2016, 07:54 PM

bare intake - purple power and hot water. clean as a whistle.

10-08-2016, 06:27 PM	#1
RestoreAmerica Registered User Join Date: Aug 2011 Location: Bristol CT Posts: 441	Top end 5.3 please advise Hello, I am a 67-72 Die Hard. I recently picked up a 2000 Yukon with a 5.3 and posted in that forum. Very little response or activity. Obviously a gear head is a gear head. I am just looking for input. Here is what I posted. Hello, I acquired this vehicle and it appear to be worth fixing. Bad head or gasket. I just ordered a set of remanufactured heads. While I have this torn apart, what else should I do to the motor. Vehicle had noisy lifters but also had bad head gasket or cracked head. I don't want to spend more than needed but don't want to tear it apart in 6 months to replace something I could easily replace now. I have not gotten the heads off yet. Almost there. I decided better just purchase heads for $300 than to just put gaskets on the old ones. These are the head I purchased http://www.ebay.com/itm/201358045312...%3AMEBIDX%3AIT Would you replace the lifters or just clean them? Any advice is appreciated. Thank you!!

10-08-2016, 07:52 PM	#2
indymachinist Registered User Join Date: Jun 2015 Location: Indanapolis, IN Posts: 603	Re: Top end 5.3 please advise Replace lifters and lifter trays. __________________ -Curt My 1968 Chevy shortbed stepside build

10-08-2016, 07:58 PM	#3
RestoreAmerica Registered User Join Date: Aug 2011 Location: Bristol CT Posts: 441	Re: Top end 5.3 please advise What about the knock sensors?

10-08-2016, 09:25 PM	#4
Dustytrix Registered User Join Date: Jan 2012 Location: Petal,Ms. Posts: 428	Re: Top end 5.3 please advise You can get to the knock sensors easy when the go bad. I would leave them alone until then.

10-08-2016, 09:47 PM	#5
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Top end 5.3 please advise What's a knock sensor? Have you tried your question in the LS swap forum? It may be for swaps but that is what you have and at least that is a place that is related to LS engines. Lots of action here, but it is for topics specific to 67-72 trucks __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

10-09-2016, 06:08 AM	#6
LeesTruk Registered User Join Date: Mar 2015 Location: Manchester, CT Posts: 433	Re: Top end 5.3 please advise The knock sensors do not live in an air tight environment and are susceptible to water intrusion and do corrode. When you pull the intake off, take a look at them and then decide. Change the knock sensor harness as well, if the sensors are corroded. The parts are readily available at most parts stores, and not cost prohibitive. Most likely, the sensor seals will have hardened and should be replaced if you pull the sensors If you need a hand, I live just up the road in Manchester. Shoot me a PM if you need assistence

10-09-2016, 07:43 AM	#7
RestoreAmerica Registered User Join Date: Aug 2011 Location: Bristol CT Posts: 441	Re: Top end 5.3 please advise I purchased lifters and trays, push rods, knock sensor, and the wiring harness that goes with knock sensor. Would anyone consider soaking the intake and TBI in kerosene, diesel, or some other type of solution to clean it?

10-09-2016, 07:54 PM	#10
Willie Makeit Registered User Join Date: Oct 2013 Location: Alabama Posts: 1,234	Re: Top end 5.3 please advise bare intake - purple power and hot water. clean as a whistle.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.