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Jeep Wrangler YJ
YJ General Discussion
New Cam, Timing Chain & Head. #1 No Compression
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<blockquote data-quote="WobWokwood" data-source="post: 429501" data-attributes="member: 19552"><p>Greetings.</p><p>I have a 1989 YJ 4.2 L with TBI. It was my daily for about 2 years, the. I had it shipped. Jeep didn’t run right, I think the distributor moved somehow and I bent a few valves and pushrods.</p><p></p><p>Head removed, took to the machine shop. All new valves installed. I also swapped the camshaft and timing chain. Now I have no compression on number one and I’m wondering if I’m 180 out on my cam.</p><p></p><p>After building it back up, trying to start, backfiring and flamage coming through the throttle body. Not trying to bend valves again.</p><p></p><p>I ran compression on number, absolutely nothing. Can’t find TDC to begin timing if I have no compression. Pissed if I have to tear it all apart again but I’ll do it to make it right.</p><p></p><p>I’m an aircraft mechanic by trade, this was my first engine pull and reinstall.</p></blockquote><p></p>
[QUOTE="WobWokwood, post: 429501, member: 19552"] Greetings. I have a 1989 YJ 4.2 L with TBI. It was my daily for about 2 years, the. I had it shipped. Jeep didn’t run right, I think the distributor moved somehow and I bent a few valves and pushrods. Head removed, took to the machine shop. All new valves installed. I also swapped the camshaft and timing chain. Now I have no compression on number one and I’m wondering if I’m 180 out on my cam. After building it back up, trying to start, backfiring and flamage coming through the throttle body. Not trying to bend valves again. I ran compression on number, absolutely nothing. Can’t find TDC to begin timing if I have no compression. Pissed if I have to tear it all apart again but I’ll do it to make it right. I’m an aircraft mechanic by trade, this was my first engine pull and reinstall. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
New Cam, Timing Chain & Head. #1 No Compression
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