F4i Crank Journal Bearings
#1
11-12-2006, 06:28 PM
F4i Crank Journal Bearings
Hi everyone,
I was hoping someone on here had some experience rebuilding F4i motors. I cracked open the crankcase to replace a worn shift fork and the damaged drum. I decided to go ahead and change the journal bearings and noticed something odd when I pulled them out. They were all the same. As opposed to the proper bearing being in the proper journal, all journals had C bearings. Is this common practice when people rebuild these motors? The history of the motor is unknown. Right now, I'm assuming the inside has been untouched and it came from the factory like this. Is this even possible? Thanks.
I was hoping someone on here had some experience rebuilding F4i motors. I cracked open the crankcase to replace a worn shift fork and the damaged drum. I decided to go ahead and change the journal bearings and noticed something odd when I pulled them out. They were all the same. As opposed to the proper bearing being in the proper journal, all journals had C bearings. Is this common practice when people rebuild these motors? The history of the motor is unknown. Right now, I'm assuming the inside has been untouched and it came from the factory like this. Is this even possible? Thanks.
#2
11-13-2006, 03:00 AM
#4
10-07-2014, 09:52 AM
Senior Member
A couple questions:
1- Is there a known weakness in the design or materials of the main bearings on these engines?
2- Is it labor intensive to replace?
I am having some work done to correct someone else's work...and he noted that it may be prudent to replace the bearings. The labor he's quoting seems a bit high to me. I'm looking for a few data points.
1- Is there a known weakness in the design or materials of the main bearings on these engines?
2- Is it labor intensive to replace?
I am having some work done to correct someone else's work...and he noted that it may be prudent to replace the bearings. The labor he's quoting seems a bit high to me. I'm looking for a few data points.
#6
10-07-2014, 12:53 PM
Senior Member
The question was posed to the forum. I do not consider it relevant if the OP returns to answer or if the answer comes from a new member.
I just hope that the answer is well reasoned and backed by experience.
I need to make a risk-based decision and do not have enough information to reliably do so.
I just hope that the answer is well reasoned and backed by experience.
I need to make a risk-based decision and do not have enough information to reliably do so.
#7
10-07-2014, 02:29 PM
Perhaps a new thread with more information would generate a discussion that would provide valuable information pertaining to your specific problem. This thread has no substance anyway.
1. Bearings are not a weak point in general. They fail when they are abused.
2. Replacing bearings on anything is labor intensive, if your doing it correctly and measuring everything that needs measurement that is.
1. Bearings are not a weak point in general. They fail when they are abused.
2. Replacing bearings on anything is labor intensive, if your doing it correctly and measuring everything that needs measurement that is.
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patmetz
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