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| Engine knock.... https://ausmini.com/forums/viewtopic.php?f=2&t=100879 |
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| Author: | Kennomini [ Tue Apr 06, 2021 11:05 am ] |
| Post subject: | Engine knock.... |
Well I think I have a problem. My A+ 1275 seems to have developed a loud "rattle". I thought is was bad engine stabilisers/mounts but having a closer look the sound appears to be mid internal (below head height). It dose seem to go away in higher revs 2k+ but it's really loud at idle and power output seems the same. What things can I check to try and rule out any other possible sources before I pull the engine out and split the box off? |
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| Author: | Steam [ Tue Apr 06, 2021 2:42 pm ] |
| Post subject: | Re: Engine knock.... |
Tappets would be the first possibility. |
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| Author: | gtogreen1969 [ Tue Apr 06, 2021 4:21 pm ] |
| Post subject: | Re: Engine knock.... |
Drop gears can rattle at low revs / low oil pressure |
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| Author: | TK [ Tue Apr 06, 2021 8:01 pm ] |
| Post subject: | Re: Engine knock.... |
idler gear rattle |
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| Author: | Kennomini [ Wed Apr 07, 2021 11:15 am ] |
| Post subject: | Re: Engine knock.... |
What would cause the idler gears to rattle? Oil pressure seems to be good 40-60psi at idle (hot and cold) |
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| Author: | drmini in aust [ Wed Apr 07, 2021 12:28 pm ] |
| Post subject: | Re: Engine knock.... |
Idler + primary gears can rattle if engine is idling at low speed, particularly with a lightened or race flywheel and a sporty cam. But that's a rattle, not a knock. I would pull spark plug leads off, 1 at a time, if it goes away it's something related to that cylinder like a worn big end bearing. If knock is there under load regardless of rpm it could be a broken crank, I've had a couple go. |
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| Author: | Kennomini [ Thu Apr 08, 2021 7:00 am ] |
| Post subject: | Re: Engine knock.... |
The engine has been in the car for over 5 years so it means something is broke........I'll try the leads and see what happens. |
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| Author: | 9YaTaH [ Thu Apr 08, 2021 8:02 am ] |
| Post subject: | Re: Engine knock.... |
What sort of driveshaft to engine type couplings? |
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| Author: | Kennomini [ Sat Apr 10, 2021 11:55 pm ] |
| Post subject: | Re: Engine knock.... |
Pot joint/cv's but the noise happens at idle when not moving. |
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| Author: | drmini in aust [ Sun Apr 11, 2021 5:10 am ] |
| Post subject: | Re: Engine knock.... |
Does it go away when you push clutch in? And what is idling speed? |
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| Author: | Kennomini [ Sun Apr 11, 2021 8:43 pm ] |
| Post subject: | Re: Engine knock.... |
Idle is around 800. I havn't noticed the clutch affecting it, I'll try to check soon. |
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| Author: | sitnlo62 [ Wed Apr 14, 2021 4:20 pm ] |
| Post subject: | Re: Engine knock.... |
Is it Crank speed or Cam speed knock. Possibly broken cam follower or perhaps Bad piston or wrist pin. |
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