Marc@DEVEK?????????
02-11-2003, 09:07 PM
#1
Burning Brakes
Thread Starter
Marc@DEVEK?????????
Hi Marc,
Currently I am investigating the replacement of my rod bearings. I am not sure how to describe the sound, but the motor seems a little loose when I just putter through a parking lot - as an example. It may be a number of things but my gut instinct makes me think that bearings are the culprit.
Through some dialogue here and there, I have learned that main bearings may or may not need to be addressed.
So, my question is------ Would you advise changing out "all" bearings while the bowels are opened up or can I address the main bearings at a later interval. Are the rod bearings quicker to start drifting away or will the main bearings more less fall in line as far as wear is concerned.
I have learned that the rod bearings are relatively easy to change once the pan is off the car. The main bearings, however, appear to be pretty involved. How difficult a task is it to change the main bearings? I would appreciate any advice you can offer on this topic.
I would really like to hit the track on March 12 but not if I am uncertain about the condition of my bearings.........
Thanx In Advance
Currently I am investigating the replacement of my rod bearings. I am not sure how to describe the sound, but the motor seems a little loose when I just putter through a parking lot - as an example. It may be a number of things but my gut instinct makes me think that bearings are the culprit.
Through some dialogue here and there, I have learned that main bearings may or may not need to be addressed.
So, my question is------ Would you advise changing out "all" bearings while the bowels are opened up or can I address the main bearings at a later interval. Are the rod bearings quicker to start drifting away or will the main bearings more less fall in line as far as wear is concerned.
I have learned that the rod bearings are relatively easy to change once the pan is off the car. The main bearings, however, appear to be pretty involved. How difficult a task is it to change the main bearings? I would appreciate any advice you can offer on this topic.
I would really like to hit the track on March 12 but not if I am uncertain about the condition of my bearings.........
Thanx In Advance
02-12-2003, 12:13 AM
#2
Burning Brakes
Join Date: Nov 2001
Location: San Diego
Posts: 1,084
Likes: 0
Received 0 Likes
on
0 Posts
Bernie,
In my experience, I have found many times a spun rod bearing and taking the motor apart showed mains in good condition. I would say, the rods will provide more stress on a bearing, the hammering they take under combustion, then load change up and down make for a extreme conditions. Where as the mains sit in the center and simply allow the crank to rotate. You might want to check the play in the crank, this could give you a heads up.
Take Care!
In my experience, I have found many times a spun rod bearing and taking the motor apart showed mains in good condition. I would say, the rods will provide more stress on a bearing, the hammering they take under combustion, then load change up and down make for a extreme conditions. Where as the mains sit in the center and simply allow the crank to rotate. You might want to check the play in the crank, this could give you a heads up.
Take Care!
02-12-2003, 12:51 PM
#3
Rennlist Member
First, cut apart the oil filter and check for metal particles, if no particles are found, check the crank fore aft movement/thrust clearances...
IF all is good, the the mains are most likely OK...to replace the mains you must pull the lower girdle off. Better to pull the enigne and do a total or partial rebuild...a lot easier.
Now, if you are removing the oil pan for whatever reason, then you can also remove a 2/6 rod cap and check the bearings. IF they look good and have no unusual wear, keep em in place, but replace the nuts with new. Or replace all the bearings and nuts..
Bearings are low cost, andgenerally will imrpove oil pressure at low rpms due to tighter clearances.
Marc
DEVEK
IF all is good, the the mains are most likely OK...to replace the mains you must pull the lower girdle off. Better to pull the enigne and do a total or partial rebuild...a lot easier.
Now, if you are removing the oil pan for whatever reason, then you can also remove a 2/6 rod cap and check the bearings. IF they look good and have no unusual wear, keep em in place, but replace the nuts with new. Or replace all the bearings and nuts..
Bearings are low cost, andgenerally will imrpove oil pressure at low rpms due to tighter clearances.
Marc
DEVEK
02-12-2003, 01:11 PM
#4
Burning Brakes
Thread Starter
Thanx Marc - John,
Appreciate the knowledgeable replies......
Cheers
<img border="0" alt="[cheers]" title="" src="graemlins/beerchug.gif" />
Appreciate the knowledgeable replies......
Cheers
<img border="0" alt="[cheers]" title="" src="graemlins/beerchug.gif" />
02-12-2003, 01:29 PM
#5
Addict
Rennlist Member
Rennlist Member
Bernie
Checking the rod bearings is not too bad, scan to the bottom of this page
<a href="http://www.928s4.com/project/bearings.htm" target="_blank">http://www.928s4.com/project/bearings.htm</a>
and you can see what my No. 2 looked like, none too clever but the engine didn't make any 'noises' although the oil pressure was lower than I would have expected.
Chris
Checking the rod bearings is not too bad, scan to the bottom of this page
<a href="http://www.928s4.com/project/bearings.htm" target="_blank">http://www.928s4.com/project/bearings.htm</a>
and you can see what my No. 2 looked like, none too clever but the engine didn't make any 'noises' although the oil pressure was lower than I would have expected.
Chris