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Jeep Wrangler YJ
YJ General Discussion
Crankshaft end play
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<blockquote data-quote="JKP" data-source="post: 437329" data-attributes="member: 19393"><p>I would guess tq converter pushing on it base on this.</p><p></p><p></p><p>If the transmission cooler lines have been pinched or crimped, excess pump pressure can cause the converter to act like a hydraulic ram, continuously jamming the crank forward. If the vehicle in question has undergone an engine replacement, make a point to closely examine the transmission cooler lines for any signs of kinking, collapse or other problems.</p><p></p><p>When beginning to diagnose a thrust bearing failure, instead of suspecting improper engine assembly, first consider the transmission-related issues that can introduce undue forward loading against the crankshaft. Check to see if any external changes were made, such as replacement of or installation of an additional cooler. Ask the customer if any performance modifications were made to the transmission. Verify that the correct flexplate and flexplate bolts were installed, and that the transmission was installed with proper alignment to the engine block (dowel pins in place). If transmission-to-cooler pressure is too high, and the return line pressure is lower, inspect for restricted cooler and cooler plumbing.</p></blockquote><p></p>
[QUOTE="JKP, post: 437329, member: 19393"] I would guess tq converter pushing on it base on this. If the transmission cooler lines have been pinched or crimped, excess pump pressure can cause the converter to act like a hydraulic ram, continuously jamming the crank forward. If the vehicle in question has undergone an engine replacement, make a point to closely examine the transmission cooler lines for any signs of kinking, collapse or other problems. When beginning to diagnose a thrust bearing failure, instead of suspecting improper engine assembly, first consider the transmission-related issues that can introduce undue forward loading against the crankshaft. Check to see if any external changes were made, such as replacement of or installation of an additional cooler. Ask the customer if any performance modifications were made to the transmission. Verify that the correct flexplate and flexplate bolts were installed, and that the transmission was installed with proper alignment to the engine block (dowel pins in place). If transmission-to-cooler pressure is too high, and the return line pressure is lower, inspect for restricted cooler and cooler plumbing. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Crankshaft end play
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