When the motor is at the machine shop and they are going to put new cam bearings in a BARE BLOCK, they can just knock the old ones out using the install tool but you can't just do that in a motor that is still assembled and still in the car. How do you propose to get the old bearings out? My question to you is, how do you change them in a completely assembled motor that is still in the car? IF THE MOTOR IS OUT AND COMPLETELY TORN DOWN. The cam bearings aren't super difficilt to replace. So why not?If you read the original post it says it is a low mileage motor that has seen regular maintenance, perfect candidate for not worrying about changing the cam bearings when he swaps cams.Īnd even if it wasn't a low mileage motor, you act like the cam bearings are easy to change, like they just fall out of the motor and the new ones just slip into place - Nothing could be further from the truth. Plus, you wont have to worry about it later. Im really shaking my head in disbelief that some of you think its not a big deal. Just because it requires more effort to change cam bearings (pressing them in) doesn't mean you should avoid it. Yeah, im sure there are but why wouldnt you change them if the motor is old? You WOULD change the crank bearings if it was the crank. 001 I will reuse the bearings already in the block. The parts also end up in the wrong boxes/mislabled. Camshafts, like anything else made by people, can - and are - made wrong from time to time. If you want long term reliability from your engine then you want to check everything. But if they are too tight or too loose it will have a major effect on oil pressure down the line to more critically loaded parts of your engine such as the main bearings. 003.Īnd yes the the cam bearings are the first things to get oil from the pump. Note that cam journal to cam bearing clearance is only. 001 of the corresponding journal on each cam and no more out of round than. You need a good micrometer to accurately check the cam journals (dial calipers wont due). If your existing engine had good oil pressure and ran good I would at least check the OD of the cam journals on both the old cam and new cam and compare (keep in mind that each journal going down the cam is made with a different diameter). cam bearings/tolerances are rarely checkedI would not agree with that at all.
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