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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
  • 109,885 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?
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Wednesday, September 14th, 2011 AT 4:49 PM
Tiny
EDGYONA10
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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.
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Thursday, September 15th, 2011 AT 5:09 AM
Tiny
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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.
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Friday, September 16th, 2011 AT 12:15 AM
Tiny
EDGYONA10
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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.
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Friday, September 16th, 2011 AT 4:32 AM
Tiny
EDGYONA10
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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.
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Friday, September 16th, 2011 AT 4:42 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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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
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Friday, September 16th, 2011 AT 5:07 AM
Tiny
EDGYONA10
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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.
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Friday, September 16th, 2011 AT 2:21 PM
Tiny
JACOBANDNICKOLAS
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Oil clearance? I'm not sure I understand.
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Saturday, September 17th, 2011 AT 2:56 AM
Tiny
EDGYONA10
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Means the required clearance between the connecting rod bearing and its corresponding crankpin journal.
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Saturday, September 17th, 2011 AT 6:49 AM
Tiny
JACOBANDNICKOLAS
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That would be the tolerance of the bearing. It should be.010
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Saturday, September 17th, 2011 AT 6:13 PM

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