Go Back   Blazer Forum - Chevy Blazer Forums > Modifications > Performance & Brainstorming > Engine & Internal
Sign in using an external account
Register Forgot Password?
Search


Welcome to Blazer Forum!
Welcome to Blazer Forum,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to start new topics, reply to conversations, privately message other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Blazer Forum today!


Closed Thread
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 03-24-2006, 06:53 PM
 
Join Date: Mar 2006
Posts: 1
halftrack is an unknown quantity at this point
Default 4.3 head gasket relacement ?

my 4x4 4.3 1991 s-10 blazer 2 dr blew a head gasket so im going to try to fix it, what other parts should i buy other than gaskets, and what else should i look for when replacing the gaskets. Is there a manual out there that has the torque values or is step by step on how to replace the gaskets

thanks: Matt

  #2  
Old 03-24-2006, 11:43 PM
Super Member
 
Join Date: Dec 2005
Posts: 1,539
4lowlife is on a distinguished road
Send a message via AIM to 4lowlife
Default RE: 4.3 head gasket relacement ?

Yep. Haynes auto repair.
  #3  
Old 03-25-2006, 01:45 AM
 
Join Date: Mar 2006
Location:
Posts: 80
tom1337 is an unknown quantity at this point
Default RE: 4.3 head gasket relacement ?

It is kind of hard to describe the steps but a factory service manual would help you greatly. If you only need torque settings then a Haynes manual will do.

The things you should look for are cracks and/or warping on the head and block. Bad cracks you can see. For small cracks there is a blue liquid (for the life of me I can not remember the name) that can be used. But I guess you would only really concerned with big cracks. Warping can be checked with just a straight edge. If you have either a big crack or warping you will need some machining or in worst case a new engine.

Additional parts you might need: I personally would replace any connecting bolts with new ARP bolts (just in case they were stressed which might cause them to break when torqued ) but you can probably get by with the old hardware. You should get some thread sealant - there might be some bolts that have to be sealed off when assembled.

Before assembly clean and inspect the head (valves, valve springs, keepers ect) for breaks, missing, or bent components.
After assembly give it an oil change and have the cooling system flushed. You also might want to have a cooling system pressure check just to make sure your gaskets set properly.
__________________
1990 Fullsize Blazer 4X4 5.7L
Auto hubs, 4L60 tranny, full floating front and rear axles 3.42 ratio, 350ci TBI, 33" tires, hvy duty pkg.
  #4  
Old 03-27-2006, 03:59 PM
Moderator
 
Join Date: May 2005
Location: Central Illinois
Posts: 3,891
Hanr3 has a reputation beyond reputeHanr3 has a reputation beyond reputeHanr3 has a reputation beyond reputeHanr3 has a reputation beyond reputeHanr3 has a reputation beyond reputeHanr3 has a reputation beyond reputeHanr3 has a reputation beyond reputeHanr3 has a reputation beyond reputeHanr3 has a reputation beyond reputeHanr3 has a reputation beyond reputeHanr3 has a reputation beyond repute
Default RE: 4.3 head gasket relacement ?

Take the head to a auto machine shop and have them magnaflux it and check for warpage. Then might talk you into replacing the valve guides and cleaning the head, both are also good ideas. If you do get it cleaned and new valve guides installed, take him both heads.

Haynes manual will work for this repair. There are better service manuals, however the Haynes manual will work.

While you have the head(s) off, notice how clean or dirty the pistons are, clena them up some. Keep them covered so the walls don't rust. Srapy them with oil (WD-40) so nothing rusts.

This is what my sons 4 banger engine looked like after I pulled th head off. He also blew a head gasket. Cost me $80 at the machine shop to have it magnaflux, cleaned, and new valve guides installed.
Click the image to open in full size.
__________________
"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
-President Ronald Reagan

'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sold
'00 S10-Blazer 4x4x4 - 212,000 miles-Sold
'04 Trailblazer 4x4x4- 56,000 miles new DD.
  #5  
Old 03-27-2006, 04:11 PM
swartlkk's Avatar
Administrator
2009 GMC Yukon Denali
My Garage
 
Join Date: May 2005
Location: Waterloo, NY
Posts: 36,886
swartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond repute
Send a message via ICQ to swartlkk Send a message via AIM to swartlkk
Default RE: 4.3 head gasket relacement ?

Magnaflux == check for cracks.

You should atleast have the heads fly cut to see if they are warped at all. Shouldn't be much to have a machine shop do this. If you have some extra cash laying around, drop the valves out and check them for wear. If none is present, re-lap them and call it good. If you see excessive wear, have a valve job done now. You'll regret it if you have to pull them off again because you are having trouble sealing the valves.
  #6  
Old 03-27-2006, 06:20 PM
New Member
 
Join Date: Mar 2006
Location:
Posts: 95
smdepew1976 is an unknown quantity at this point
Default RE: 4.3 head gasket relacement ?

and for the love of god replace your valve seals if you don't they will surely start leaking oil with a week....never fails
__________________
1996 Blazer LS 2wd 4.3 auto
Old 03-27-2006, 06:20 PM
 
 
 
Closed Thread

Tags
1991, 43, 96, blazer, chevy, cost, diy, gasket, gaskets, head, job, magnafluxing, procedure, replace, s10


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are On
Pingbacks are On
Refbacks are On


Advertising

Featured Sponsors
Vendor Directory
Our Sponsors

All times are GMT -5. The time now is 06:26 AM.

Internet Brands, Inc.