Rod bearings and main bearing replacement

Tiny
AUTRY
  • MEMBER
  • 1998 CHEVROLET BLAZER
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Is it possible to do rod bearings and main bearings on my 4.3 liter VTEC on my 1998 Blazer four wheel drive without pulling the motor out of the truck?
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Wednesday, August 22nd, 2018 AT 1:15 PM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi and thanks for using 2CarPros. Com.

Honestly, if you can get the pan off, it is possible. The only issue is if the crank is worn and needs cut or replaced. Then the engine needs to come out.

If you do this, make sure the rod bearing caps stay at the same cylinders facing the same way. Same with the main bearings.

The first four pictures I attached are all the torque specs and tolerances for rod and main bearings.

Now for the bad news. If you need to replace the rear main seal, the transmission needs separated from the engine. The seal is a once piece component. Here are the directions for replacing it. Pictures 5 and 6 correlate with these directions

__________________________

1998 Chevy Truck S10/T10 Blazer 4WD V6-4.3L VIN W
Crankshaft Rear Oil Seal Replace
Vehicle Engine, Cooling and Exhaust Engine Seals and Gaskets Rear Crankshaft Main Bearing Seal Service and Repair Procedures Crankshaft Rear Oil Seal Replace
CRANKSHAFT REAR OIL SEAL REPLACE
REMOVAL PROCEDURE
1. Remove the transmission assembly.
2. Remove the flywheel.
3. Remove the crankshaft rear oil seal from the crankshaft rear oil seal housing. Insert a suitable tool into the access notches and then carefully pry the crankshaft rear oil seal from the crankshaft rear oil seal housing.
4. Discard the crankshaft rear oil seal.

INSTALLATION PROCEDURE

Tools Required
- J 35621-B Rear Seal Installer

IMPORTANT: Do not oil or grease the crankshaft rear oil seal lip or the crankshaft.
1. Use the J 35621-B in order to install the NEW crankshaft rear oil seal.
2. Install the engine flywheel.
3. Install the transmission assembly.

I hope this is helpful. Make sure when you remove the oil pan to clean the oil pick-up screen and any dirt from in the pan. Also, something is telling me you are going to have to lift the engine somewhat to get the pan off. In all honesty, in some cases removing the engine is easier. This may be one of them

Let me know if this helps or if you have other questions.

Take care,
Joe
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Wednesday, August 22nd, 2018 AT 6:28 PM

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