SPONSORED LINKS

What is the engine oil clearance of the connecting rod bearing and its cap Bolt. Nit tightening torque?

Tiny
EDGYONA10
  • MEMBER
  • 1987 MERCEDES BENZ 260E
  • 33,400 MILES
The connecting rod bearings are due for replacement
Wednesday, September 14th, 2011 AT 9:35 AM

10 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
The bearings shouldn't need replaced at 33K miles. Are you getting a knocking from the engine? Has the oil been changed on a regular basis?
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, September 14th, 2011 AT 4:49 PM
Tiny
EDGYONA10
  • MEMBER
  • 6 POSTS
The engine oil pressure was such too low. Zero reading as engine warms up. An oil change is not followed at its regular changing intervals.
Was this
answer
helpful?
Yes
No
Thursday, September 15th, 2011 AT 5:09 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Can you hear the rod bearings knocking? My concern is that it may just be a bad oil sending unit. You may want to check oil pressure with a mechanical gauge to confirm the pressure is very low. As far as clearance between the bearings and crank, you are looking at thousands of an inch. You need plasta-gauge to check if they are bad.
Was this
answer
helpful?
Yes
No
Friday, September 16th, 2011 AT 12:15 AM
Tiny
EDGYONA10
  • MEMBER
  • 6 POSTS
There's no knocking noise whatsoever. Since we've got to change the conrod bearing, we will be using plasti-gauge to initially check the clearances. May we please know the oil clearance tolerance and the tightening torque of the conrod bolts. Thanks.
Was this
answer
helpful?
Yes
No
Friday, September 16th, 2011 AT 4:32 AM
Tiny
EDGYONA10
  • MEMBER
  • 6 POSTS
By the way, what is the specific lenght measurement of the oil pump relief valve spring. Sorry for the mis typing of mileage run, it should be 68,912.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Friday, September 16th, 2011 AT 4:42 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Connecting rod journals diameter 1.8880 - 1.8884 inches or 47.955 - 47.965mm

Torque:
Step 1. 22 ft lbs
Step 2. Angle tighten 90 degrees

I don't have the length of the relief spring. All I can find on that is it is set to release at 71 psi
Was this
answer
helpful?
Yes
No
Friday, September 16th, 2011 AT 5:07 AM
Tiny
EDGYONA10
  • MEMBER
  • 6 POSTS
Thanks for the info, it will best serve us if the measurement has to be taken on the flattened plasti-gauge rather than taking the difference between the diameter of the big end bore against the diameter of the crankpin journal. I reasoned out that I dont have caliper and bore measuring tools. May I please know the oil clearance dara, your help is so much appreciated. Thanks.
Was this
answer
helpful?
Yes
No
Friday, September 16th, 2011 AT 2:21 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Oil clearance? I'm not sure I understand.
Was this
answer
helpful?
Yes
No
Saturday, September 17th, 2011 AT 2:56 AM
Tiny
EDGYONA10
  • MEMBER
  • 6 POSTS
Means the required clearance between the connecting rod bearing and its corresponding crankpin journal.
Was this
answer
helpful?
Yes
No
Saturday, September 17th, 2011 AT 6:49 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
That would be the tolerance of the bearing. It should be.010
Was this
answer
helpful?
Yes
No
Saturday, September 17th, 2011 AT 6:13 PM

Please login or register to post a reply.

Sponsored links