Farm Equipment - 170 Gas Will Not Start

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170 Gas Will Not Start

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=104232
Printed Date: 10 Sep 2025 at 9:59am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 170 Gas Will Not Start

Posted By: Slim
Subject: 170 Gas Will Not Start
Date Posted: 03 Apr 2015 at 10:50am

I bought this 170 with a stuck engine. I have since freed the engine and completely refurbished the fuel tank and carb. There is free flowing fuel to the carb and the bowl fills. I have spark on all plugs. However, I cannot get the thing to fire not even on starting fluid. What's the problem? The engine only has 2,100 hrs on it. What am I missing?

-Slim

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AC 1971 170 WF Gas, AC 185 Diesel WF, AC WD NF, AC '54 WD45 NF, AC 7080, AC 7030, Wheel Horse D-180 Automatic

Replies:

Posted By: Tracy Martin TN
Date Posted: 03 Apr 2015 at 10:58am

Have you had the valve cover off and looked at the valves? What is the compression on each cylinder? Sounds like it won't draw fuel mixture into cylinder. What did you do to free up the engine? Tracy

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No greater gift than healthy grandkids!

Posted By: Slim
Date Posted: 03 Apr 2015 at 11:10am

Tracy Martin TN wrote:

Have you had the valve cover off and looked at the valves? What is the compression on each cylinder? Sounds like it won't draw fuel mixture into cylinder. What did you do to free up the engine? Tracy

I haven't had the valve cover off. That's a good idea. I'll do that next. I haven't checked compression. Probably a good idea to do that as well. As for freeing up the engine, I soaked the cylinders with Marvel Mystery Oil.

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AC 1971 170 WF Gas, AC 185 Diesel WF, AC WD NF, AC '54 WD45 NF, AC 7080, AC 7030, Wheel Horse D-180 Automatic

Posted By: DrAllis
Date Posted: 03 Apr 2015 at 12:09pm

COMPRESSION TEST !!!!!!!!!!!!

Posted By: Tracy Martin TN
Date Posted: 03 Apr 2015 at 12:28pm

If that is all you done, you will find the compression test really low I bet. If an engine is stuck that it takes more than a little effort to free. I would at least pull the valve cover and look, most of the time get the head off as well. Tracy

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No greater gift than healthy grandkids!

Posted By: SteveM C/IL
Date Posted: 03 Apr 2015 at 3:14pm

...check your firing order making sure to know distributor rotation.Stuck engine often means stuck rings too.

Posted By: Slim
Date Posted: 07 Apr 2015 at 6:41pm

It runs!!! Finally. The problem was bad spark plugs. Now all I have to do is free the clutch up.

-Slim

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AC 1971 170 WF Gas, AC 185 Diesel WF, AC WD NF, AC '54 WD45 NF, AC 7080, AC 7030, Wheel Horse D-180 Automatic