Main bearings or not?
#1
Main bearings or not?
Hi
Someone told me that I shouldn't have any need to replace the main bearings in my 96 850 with 215K. I'm taking the engine down to do rod bearings and rings. Any ideas? I hate to go this far and not do the mains but it would save me spliting the block.
Also, what material are the cylinders? cast iron? aluminum? Nikasil? I want to get a flex hone but don't know if I should get the Aluminum oxide for nikasil or the silicon carbide.
Thanks
Someone told me that I shouldn't have any need to replace the main bearings in my 96 850 with 215K. I'm taking the engine down to do rod bearings and rings. Any ideas? I hate to go this far and not do the mains but it would save me spliting the block.
Also, what material are the cylinders? cast iron? aluminum? Nikasil? I want to get a flex hone but don't know if I should get the Aluminum oxide for nikasil or the silicon carbide.
Thanks
#2
#3
#4
It's called a Plasti-gauge(any parts store will give them to you). Used to check the bearing oil clearance. Not typically used to check old bearings. A visual inspection of the bearing halves usually tells all you need to know about the condition. You will be able to see discolorations, plating that has worn through etc. As for the journals, an easy test is run a penny across the journal or a finger nail and if your nail catches or any copper comes off the penny, the crank should be inspected further by a machine shop for out-of-round and possibly be turned or polished.
For the OP. the cylinders are not lined with Nikasil or Alusil. Just make sure to use the correct grit hone for the cylinders where chrome rings will be used.
PS. For someone to make a general statement that the main bearings should not need replacing due to only taking into consideration the mileage, is a bit ludicrous. You should always, at least, do a visual inspection of the rods and mains of any engine, especially when you will have the engine torn down as far as you will.
For the OP. the cylinders are not lined with Nikasil or Alusil. Just make sure to use the correct grit hone for the cylinders where chrome rings will be used.
PS. For someone to make a general statement that the main bearings should not need replacing due to only taking into consideration the mileage, is a bit ludicrous. You should always, at least, do a visual inspection of the rods and mains of any engine, especially when you will have the engine torn down as far as you will.
Last edited by schigara; 11-09-2009 at 08:44 PM.
#6
Thanks All,
Gilbert... are you going to rebuild that engine? I remember you telling me I should find a used one...what's up with that? Anyway.. my engine is being plucked this weekend so we should compare notes if that's your path.
Schigara... I really appreciate your perspective in your recent thread on rebuilding after timing belt damage, it helped inspire me to rebuild my engine. Even though I am doing it as preventative measure.
Turns out the cylinders are cast iron... according to Haynes.
Gilbert... are you going to rebuild that engine? I remember you telling me I should find a used one...what's up with that? Anyway.. my engine is being plucked this weekend so we should compare notes if that's your path.
Schigara... I really appreciate your perspective in your recent thread on rebuilding after timing belt damage, it helped inspire me to rebuild my engine. Even though I am doing it as preventative measure.
Turns out the cylinders are cast iron... according to Haynes.
#7
Thanks All,
Gilbert... are you going to rebuild that engine? I remember you telling me I should find a used one...what's up with that? Anyway.. my engine is being plucked this weekend so we should compare notes if that's your path.
Turns out the cylinders are cast iron... according to Haynes.
Gilbert... are you going to rebuild that engine? I remember you telling me I should find a used one...what's up with that? Anyway.. my engine is being plucked this weekend so we should compare notes if that's your path.
Turns out the cylinders are cast iron... according to Haynes.
#10
#11
The main reason I wanted to rebuild a motor. I don't care if it necessarily needs it or not, I want to see what it looks like inside.
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