Engine has previously had the rotor / flywheel changed as suffered magnets coming detached , has a knock that sounds like the bottom end , maybe big ends , feel the crank end float may not have been set up correctly when new rotor fitted , just wondering if anyone out there has the specs for end float , it feels excessive have not measured it yet, any info would be great , thanks , James.
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Re: engine knocks on idle
I would be checking that the rotor has been torqued up properly too. You can get a manual from here. Is for later model bike, but the essence of these things should be the same. Thanks for using Fixya.Good luck with getting it sorted. A FixYa vote is a great reward for helping you out here. Cheers
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sounds like lower engine damage, could be a bearing or low oil pressure but if knocking the damage is done. i would have a tech just double check it to make sure, i have seen flywheels make noise and pulleys and a/c compressors, so just make sure it is in the oil pan if so then engine will need repair.
You didn't state the mileage (would help with diagnosis) But unfortunately you have suffered major engine damage. And that would depend if the knocking you hear is steady at engine idle or only knocks when reving the engine . For some reason the oil pressure did fall to zero, most likely due to bearing wear but again depends on mileage. If knocks constant at idle it is a spun main bearing, if knocks only while reving engine it is a spun connecting rod bearing. Either require an engine overhaul. Or engine swap, Once again it depends on how many miles you have the engine to determine if its wise to rebuild it or replace it. I hope this answers your Q.....
I'm assuming your mechanic changed the rod bearings also. There is also a thrust bearing which keeps the crankshaft from sliding back and forth as it spins. Also check your flywheel/flex-plate, depending on whether your vehicle is auto or stick. Sometimes they crack and can cause a knocking sound.
knocking? not ticking? drain your engine oil and drag a magnet through it. Look for metal that is gray or copper. Ouch, If you find anything, you have a rod bearing gone. It can be repaired if it hsn't hammered the rod or crand flat.
If it knocks at 50 it will knock sitting still if you race it up. Is the oil pressure good? These motors hardly ever have a bearing problem. The only knock problem was the harmonic balacer that comes apart and knocks. The rubber falls apart and it will make a knock sound all the time, more with the ac on. If you have a knock at 50 or highway speed only you may need a outer tie rod end only. Get the front end checked as they will make a knocking sound on the highway. reply
sound like an internal engine problem. either one or more of the pistons has "piston slap" and that knocking will diminish as the engine warms up or possibly a rod bearing is worn out. have a tech do a manual oil pressure test to make sure the oil pump and main bearings are ok. piston slap or knock that decreases when the engine warms up is not that serious, but a rod bearing knock or possible oil pump failure should be taken care of asap.
A knock is not good. Does it change when you put the car in gear? Is it loud enough to hear at idle? If it changes in gear then it is a possible cracked flywheel. If not you can idle the car pull the plug wires 1 at a time to see which one changes the sound. This will tell you which cyl has the problem. If it changes pulling the wires then it is an internal engine problem, get ready to spend some money, sorry. Good Luck.