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1963 196 not running right |
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al1630
AMC Apprentice Joined: Oct/05/2017 Location: Boise, Idaho Status: Offline Points: 174 |
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I got the oilpan all unbolted, but it won't drop without hitting the steering in the front. Edit: looks like it has to come off. I've never done it before, how is it done?
Edited by al1630 - Apr/13/2019 at 5:32pm |
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Alex
1963 Rambler American 440H |
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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why are you dropping the pan? just a cleanout? if you start poking around in there, ... lol. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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al1630
AMC Apprentice Joined: Oct/05/2017 Location: Boise, Idaho Status: Offline Points: 174 |
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I figured that I would clean it and check it out in there while I had other parts off the engine. I'll have to be careful not to get carried away in there!
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Alex
1963 Rambler American 440H |
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al1630
AMC Apprentice Joined: Oct/05/2017 Location: Boise, Idaho Status: Offline Points: 174 |
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I got the pan off and pulled out the pistons, and here's what I found: Left is #1 piston, right is #4, which I noticed also had a chip out of the top once the head came off. No wonder there was no compression. I noticed that both of these were very rough on top, all the other pistons were fine on the sides and mostly smooth on top. |
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Alex
1963 Rambler American 440H |
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pacerman
Supporter of TheAMCForum Joined: Jul/03/2007 Location: United States Status: Offline Points: 9048 |
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That could be due to pretty extreme detonation (AKA spark knock). Some previous owner was probably not paying attention to proper timing or how the engine sounded when running. Buy the way I have a low time used set of .040 oversize pistons, cheap , if you need them. Joe
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Happiness is making something out of nothing.
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al1630
AMC Apprentice Joined: Oct/05/2017 Location: Boise, Idaho Status: Offline Points: 174 |
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How far off would the timing have to be to cause detonation this bad? I wonder why it's only on two pistons. Thanks for the piston offer, but I already ordered some pistons on ebay.
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Alex
1963 Rambler American 440H |
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pacerman
Supporter of TheAMCForum Joined: Jul/03/2007 Location: United States Status: Offline Points: 9048 |
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A lot of things influence detonation, including fuel mixture (which varies from cylinder to cylinder) and deposits of carbon on the piston tops, which of course might be different on different cylinders. Joe
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Happiness is making something out of nothing.
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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yowza! i've never seen anything like that. detonation usually eats the top off. what eats the sides?! i know it's not, but it looks like localized electrochemical corrosion. freaky weird. it seems unlikely that the cylinder walls could survive unscathed.
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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al1630
AMC Apprentice Joined: Oct/05/2017 Location: Boise, Idaho Status: Offline Points: 174 |
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I bought some NOS hastings piston rings and the second rings come with this hexagonal metal band in the package. What's it's purpose? I wanted to check before I install them. |
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Alex
1963 Rambler American 440H |
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19611 |
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I've never seen pistons like that either! I've burned a hole in one due to a lean condition (dual carbs on a six -- rear carb main jet got trash in it, couldn't tell until it holed the leanest piston, #6!). It almost looks like they were leaned out and burned, but only those two? The two ends starve first, so #1 I can understand, but no way a center piston was leaned out and burned! Must have been detonation hammering the pistons, then burning down the sides where a bit of top ring land broke off.
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Frank Swygert
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