You want to keep one hand on the plastic centering guide, if the bearing gets cocked to the side, it will get ruined. Using a flashlight shining into the cam bearing, you can see the alignment of the bearing to the main oiling hole. You need to check this on every bearing. Some bearings have one hole while others have two or three. You can see that this Mopar bearing has the main feed hole on the bottom and two smaller holes up top. These feed the lifter galley, and they are not interchangeable, you have to line them up right.
There are specialty bearings available with grooves on the backside, the grooves allow more oil to circulate around the bearing and out to the block.
Getting the bearings perfectly lined up is not easy; you need to take your time. Here, the oiling hole to the right is just off center. This is acceptable; you should have seen the factory bearings, a couple of them were way off.
One trick for keeping the holes lined up is marking the bearing and tool for alignment. Sometimes, the bearings try to rotate in the bore, making it difficult to install the bearing correctly.
This will show that and help you correct it. The block was marked for the main oiling hole; this corresponds with the cam bearing marks on the tool. Once the bearing is driven in place, you can see if the hole is lined up or not. Another option is to chamfer the oiling holes in the block with a carbide bit. This eliminates the overhang of the block-to-bearing hole issue, and it will actually increase oiling to the camshaft and subsequent system down the path.
Just make sure you clean the block out before installing the bearings. Once all of the bearings are installed, the rear freeze plug needs to be installed. You also want to check the fit of the camshaft. If there is any binding at all, you have a problem. Find the bad bearing and replace it before doing anything else. A little thread locker goes a long way on a freeze plug. This is medium strength locker from Valco.
The plug needs to be flush with the back of the block, any further and it may keep the camshaft from sliding in all the way. Notify me of follow-up comments by email. Notify me of new posts by email. Steering Fastener Kits. Suspension Fastener Kits. Wheel and Tire Fastener Kits.
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Suspension Tuning. Normally during factory production semi-finished cam bearings are put in the block and line-bored into place to eliminate any tolerance stack that you would see from the housing geometry variations. In the case of the high performance bearings, they are held to 0. McBroom says that, in some cases, it could be advantageous to run a high performance bearing in a passenger car if the tolerances are such that your oil clearances are out of spec.
Advertisement In general, camshaft bearings can suffer from overloading, oil starvation, misalignment and contaminated oil. The possible failures are material fatigue, excessive wear, seizure and corrosion. Cam bearings are usually available in a range of basic bearing constructions. One is a standard babbitt bearing, another is a high-performance bearing, and the third is an even higher-performance Teflon-coated bearing. Before starting, make certain that the block is totally clean.
Before installing cam bearings, wipe all cam bores with a fast-drying solvent to create a clean and dry bore surface. Installation of cam bearings into the block must be done carefully to avoid shaving material from the outside diameter of the bearings.
Make sure the oil holes are lined up. They can have some blocks that are out of spec and some that are out of round.
Some camshafts can have rough surface finishes that can fail a bearing. Minimum clearance should be 0. Advertisement If cam fit is too tight, bearing material can be removed by reaming. Honing bearings to size is not recommended because honing stone grit can easily be trapped in the bearing surface, and its presence can lead to premature camshaft journal wear. The block can become distorted due to temperature extremes overheating and improper cylinder head installation where excessive or unequal cylinder head fastener tightening had occurred.
This is why camshaft fitment problems sometimes occur when dealing with a used block. However, with a little patience and a close attention to detail during the cam assembly, you can readily overcome such problems. Features: Internal Combustion Engines vs. Electric Vehicles EV. Features: Justina Reusch, Reusch Diesel. Tech Center. Digital Edition. Buyers Guide. Contact Us. Magazine Current Issue Past Issues.
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