Strange sound from rebuilt engine...
#1
Burning Brakes
Thread Starter
Strange sound from rebuilt engine...
Just started up my newly rebuilt engine (top end) and am experiencing a very loud rattling sound (louder than it sounds in video). See attached video (please excuse my poor directorial skills). It sounds like a freight train. What do we think is making this noise? It definitely does not sound right. I have eliminated the fan/alternator as the source by testing without the belts attached.
#6
Burning Brakes
Thread Starter
I had a friend over and that was his first thought. His second thought was, "that engine sounds dry - any oil in it?" Ten quarts.
Well, that's possible too although I looked up the german for top, bottom, left and right and was very careful. I think I took pictures so I'll check.
#7
Rennlist Member
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#9
Burning Brakes
Thread Starter
Yes, correct. I should have been more clear. I put ~9-~10 in which is roughly what I drained out of it.
So with the lifters do I proceed with the 20 minutes 2000 RPM as per Wayne's book with the idea that the noise will die down?
Thanks everyone!
#11
Burning Brakes
Thread Starter
As for it running - besides the noise it seems very strong. No misfires or anything like that. The throttle has a little slack in it but I will adjust that a little later.
#12
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Lifters, they need to pump themselves up. Sounds like the tech didn"t do them prior to assembly to get out any traped air or they bleed down during the assembly if there was substancial time between assembly and engine start. should be OK.
#13
Race Director
Yes, many times during the rebuild process. It seemed to turn over with a little resistance here and there. Harder after plugs.
As for it running - besides the noise it seems very strong. No misfires or anything like that. The throttle has a little slack in it but I will adjust that a little later.
As for it running - besides the noise it seems very strong. No misfires or anything like that. The throttle has a little slack in it but I will adjust that a little later.
Oil pressure is good I'm assuming?
#14
Race Car
This sure does sound like a lack of oil issue. Total capacity if you drained everything is more than 9. Did you drain the oil lines, oil cooler etc?
Had a friend do a WB conversion on a cab recently, so the oil system was completely drained as the oil tank etc had to be removed. The car sat for quite a wile before it was restarted. On first restart there was wuite alot of lifter noise, we checked the oil, it was at the bottom of the dip stick, as soon as we started topping up the oil the noise disappeared.
I would get the noise fixed prior to doing the 20 min 2000 rpm run in.
Had a friend do a WB conversion on a cab recently, so the oil system was completely drained as the oil tank etc had to be removed. The car sat for quite a wile before it was restarted. On first restart there was wuite alot of lifter noise, we checked the oil, it was at the bottom of the dip stick, as soon as we started topping up the oil the noise disappeared.
I would get the noise fixed prior to doing the 20 min 2000 rpm run in.
#15
Burning Brakes
Thread Starter
This sure does sound like a lack of oil issue. Total capacity if you drained everything is more than 9. Did you drain the oil lines, oil cooler etc?
Had a friend do a WB conversion on a cab recently, so the oil system was completely drained as the oil tank etc had to be removed. The car sat for quite a wile before it was restarted. On first restart there was wuite alot of lifter noise, we checked the oil, it was at the bottom of the dip stick, as soon as we started topping up the oil the noise disappeared.
I would get the noise fixed prior to doing the 20 min 2000 rpm run in.
Had a friend do a WB conversion on a cab recently, so the oil system was completely drained as the oil tank etc had to be removed. The car sat for quite a wile before it was restarted. On first restart there was wuite alot of lifter noise, we checked the oil, it was at the bottom of the dip stick, as soon as we started topping up the oil the noise disappeared.
I would get the noise fixed prior to doing the 20 min 2000 rpm run in.
My plan for today is to run the engine at idle and let it warm up to get the oil flowing. If noise continues after 15 - 20 minutes I'll check the dip stick and add some oil as suggested. The adventure continues, will report back later.