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67 289 Engine knock
- Thread starter Dave2g
- Start date
jims6t6
Well-Known Member
Easy but costly.
jims6t6
Well-Known Member
Been a while since I had one overhauled. the last one was in the early 90' in CA came with a 3 year 50,000 warranty $2500. Included pulling and reinstalling.
It's more than likely a spun bearing... it could be one of the main bearings on the crank, or a rod bearing in the crank... or a cam bearing.
If it's a rod bearing, you can sometimes localize it by pulling spark plug wires off one at a time. Usually the knock sound will stop or diminish some when the cylinder isn't firing.
Cost depends on what your looking to spend on the fix, how much of it do you want to do it yourself, and how long you want the repair to last...
Cheapest is do it yourself changing just the offending rod bearings if the crank is ok... less than 100 bucks... but might last 2 minute, might last a few years.
Anything more than that means pulling the engine out for replacement or rebuilding which could range from a few hundred for a used motor to many thousands depending on what you want and who's going to do the work...
If it's a rod bearing, you can sometimes localize it by pulling spark plug wires off one at a time. Usually the knock sound will stop or diminish some when the cylinder isn't firing.
Cost depends on what your looking to spend on the fix, how much of it do you want to do it yourself, and how long you want the repair to last...
Cheapest is do it yourself changing just the offending rod bearings if the crank is ok... less than 100 bucks... but might last 2 minute, might last a few years.
Anything more than that means pulling the engine out for replacement or rebuilding which could range from a few hundred for a used motor to many thousands depending on what you want and who's going to do the work...
Often folks mistake the sound of a exhaust leak with rod knock; it's worth investigating as it is relatively easy to check and cheap to fix. I bring this up as you said you can hear it from a block away.
Use of a stethoscope or similar device can help isolate exactly where the noise is coming from.
Use of a stethoscope or similar device can help isolate exactly where the noise is coming from.
In all likelihood you are looking at a rebuild if your suspicions are correct. If you are going to open up the engine to diagnose and repair/replace it's almost always best to rebuild. After pulling it and taking it apart why not slip in new parts?
Depending on damage (limited to bearings?) you will likely need at least some minor machine work done. If you remove, disassemble, reassemble and install yourself it's($$$) not too bad. If you stay stock, Start upgrading and you can spend as much as you want.
Depending on damage (limited to bearings?) you will likely need at least some minor machine work done. If you remove, disassemble, reassemble and install yourself it's($$$) not too bad. If you stay stock, Start upgrading and you can spend as much as you want.
guruatbol
Always on vacation!
I've done some budget rebuilds in my younger years.
You will have to at the minimum have to have the bearings bored and a new crank. If you measure your cylinders and they are within the correct limits for new rings in your existing pistons and your pistons are still good, you will have to do the cam bearings, rod bearings, and crank with new bearings and new rings. You would want to hone your cylinders and install a new oil pump.
You will need a gasket set and I would say new hoses too.
How much you spend depends on how much you do and how much damage has been done.
I will say this the SBF is one of the easiest V8 engine I can think of to rebuild followed by the SBC 350. I have done them in a day with the parts sitting there and the machining done.
If you can buy a short block you may be money ahead. you will have to install all the top end stuff you take off your engine, but it will save time and money and less expertise is required. Also less special tools are needed.
Mel
You will have to at the minimum have to have the bearings bored and a new crank. If you measure your cylinders and they are within the correct limits for new rings in your existing pistons and your pistons are still good, you will have to do the cam bearings, rod bearings, and crank with new bearings and new rings. You would want to hone your cylinders and install a new oil pump.
You will need a gasket set and I would say new hoses too.
How much you spend depends on how much you do and how much damage has been done.
I will say this the SBF is one of the easiest V8 engine I can think of to rebuild followed by the SBC 350. I have done them in a day with the parts sitting there and the machining done.
If you can buy a short block you may be money ahead. you will have to install all the top end stuff you take off your engine, but it will save time and money and less expertise is required. Also less special tools are needed.
Mel