8070 head gasket?
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=170457
Printed Date: 28 Aug 2025 at 3:07pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 8070 head gasket?
Posted By: Leon B MO
Subject: 8070 head gasket?
Date Posted: 23 Apr 2020 at 2:25pm
|
Yesterday dad was field cultivating with the 8070 when he said he started to smell antifreeze. He shut it off, I went back to start it about an hour later, when it turned over it had lots of white smoke in the exhaust, after a bit it did start but sounded horrible. I set my finger on the radiator cap and you could actually feel compression on the system. Pulled it in the shop this morning, just found the problem. Head gasket is completely gone between 5 and 6. Ordered head gasket set from AGCO. The head looks to be okay, liners feel good look good, Pistons feel good look good. There was a lot of water in the oil, but I plan to let it drip dry for some time. My question is what should I or should I not do in the process of putting this back together? The injectors were done this past winter and a new core put in the radiator. Should I go ahead and have the head sent off? Just looking for any extra information from the guys that know better. Thanks. Leon B Mo ------------- Uncle always said "Fill the back of the shovel and the front will take care of itself". |
Replies:
Posted By: DrAllis
Date Posted: 23 Apr 2020 at 3:53pm
| What I would do depends on how many hrs it has on it. How close are you to an overhaul ?? Also, torque head bolts to 150 ft lbs, run for a couple of hrs at full throttle or go to the field for a day under light loads and the next morning re-torque to 165-170 ft lbs when stone cold. Use gun grease on head bolt threads or molycoat paste of some kind. Tappets at .017" COLD. |
Posted By: injpumpEd
Date Posted: 23 Apr 2020 at 4:08pm
|
A neat little trick a puller friend told me about, is to leave the rockers off, and use 6 more short bolts from a donor engine, and torque all 26 bolts as if the rockers were there. Once torqued down to 165, we pull the 6 dummy bolts out, and set the rocker assy on and torque them. The problem is when you torque the rocker stand long bolts, it loosens the ones under the rocker shaft. The offset tool just flexes too much. After going to studs on my 210, I scavenged a set of stands off an old rocker assy, and slide them on the long studs, and do my usual thing. ------------- 210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers! |
Posted By: DrAllis
Date Posted: 23 Apr 2020 at 4:18pm
| I have a tool to torque all 26 or 27 bolts at the same time. |
Posted By: MACK
Date Posted: 23 Apr 2020 at 8:39pm
| What kind of a tool do you have? I have one to go under the shaft. MACk |
Posted By: Leon B MO
Date Posted: 24 Apr 2020 at 6:29am
|
So, leave hood off don't use permatex on valve cover gasket, start it, bring it up to full running temp for couple hours, let cool down and re-torque. Then button it up. Thanks. Leon BMo ------------- Uncle always said "Fill the back of the shovel and the front will take care of itself". |
Posted By: DrAllis
Date Posted: 24 Apr 2020 at 7:07am
| My preferred method was to run for a couple of hrs, hit the dyno for 15 or 20 minutes at full load and then retorque in the morning when cold to 165-170 ft lbs. I have an exhaust pipe that sticks out to the side that is held with one bolt so I don't mess with the muffler until I am all done. I never take the top hood off, but that's just me. My tool is an old Snap-on offset to get under rocker arm shaft. |
Posted By: Leon B MO
Date Posted: 24 Apr 2020 at 6:03pm
|
Okay, I have a crow foot 3/8 drive three-quarter inch line wrench, or 1/2 drive open end crow foot. Is that applicable? Or will that distort the actual torque applied? My retired Ace AC mechanic is under the weather right now and I don't know if I can get his input on this. Thanks again. Dropped the head off this morning to be planed, dipped, checked. Leon B ------------- Uncle always said "Fill the back of the shovel and the front will take care of itself". |
Posted By: DrAllis
Date Posted: 24 Apr 2020 at 6:47pm
| Line wrench will not stand 165 ft lbs of torque. |
Posted By: SteveMaskey(MO)
Date Posted: 24 Apr 2020 at 6:48pm
 This is probably what the Dr is talking about. ½’ drive on top and 3/4 “ bottom 5 ½” clearance. Snap-on S9513C. You can use it if it will work
|
Posted By: Leon B MO
Date Posted: 24 Apr 2020 at 8:00pm
|
Thanks guys for all the input. I'll have several days until the head is ready to try to gather any tools I'll need. Hopefully by then my mechanic will give me his insight or lend me his tools also. Leon B ------------- Uncle always said "Fill the back of the shovel and the front will take care of itself". |