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Jeep Wrangler YJ
YJ General Discussion
Engine Rebuild Adventure - Advice Needed
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<blockquote data-quote="jthops" data-source="post: 438856" data-attributes="member: 20901"><p>I've been working on a 93 YJ project</p><p>for my daughter. After doing body/paint and mechanical upgrades, I decided I wanted to rebuild the tired 2.5 L engine, which had low compression in cylinder 1 and some piston slap. It has been a pretty good experience, except for the premium I paid the machinist. Yesterday, about 15 minutes into the engine break in, a loud knock (not tick) showed up. I shut it down, dropped the oil pan, and everything looked good (no metal). Given the oil pressure and temperature were good, I convinced myself that the knock was coming from somewhere else. Put in more breakin oil, and fired it up again today. It's definitely rod knock - loud, increases with load and acceleration, deep knock, coming from the bottom of the engine, ... Ugh. A brand new engine and all that work.</p><p></p><p>So, I guess I'll drop the oil pan again and see if I can detect any play in any of the rods and check the rod bearings. Any advice on something specific I should be looking for? Is it possible replace a bad bearing without pulling the engine, again. The machinist ordered my rebuild kit and told me they confirmed all the clearances. I'm not sure where I went wrong, or if it was their fault.</p><p></p><p>Live and learn ... the hard way. Thanks in advance for any feedback.</p><p></p><p>[ATTACH=full]121618[/ATTACH]</p></blockquote><p></p>
[QUOTE="jthops, post: 438856, member: 20901"] I've been working on a 93 YJ project for my daughter. After doing body/paint and mechanical upgrades, I decided I wanted to rebuild the tired 2.5 L engine, which had low compression in cylinder 1 and some piston slap. It has been a pretty good experience, except for the premium I paid the machinist. Yesterday, about 15 minutes into the engine break in, a loud knock (not tick) showed up. I shut it down, dropped the oil pan, and everything looked good (no metal). Given the oil pressure and temperature were good, I convinced myself that the knock was coming from somewhere else. Put in more breakin oil, and fired it up again today. It's definitely rod knock - loud, increases with load and acceleration, deep knock, coming from the bottom of the engine, ... Ugh. A brand new engine and all that work. So, I guess I'll drop the oil pan again and see if I can detect any play in any of the rods and check the rod bearings. Any advice on something specific I should be looking for? Is it possible replace a bad bearing without pulling the engine, again. The machinist ordered my rebuild kit and told me they confirmed all the clearances. I'm not sure where I went wrong, or if it was their fault. Live and learn ... the hard way. Thanks in advance for any feedback. [ATTACH type="full"]121618[/ATTACH] [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Engine Rebuild Adventure - Advice Needed
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