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PenelopeLandrover

Member
New to the forum, posted this already in the wrong place then found this discussion. I’m rebuilding a series 3 with a J19. The engine has had new pistons, big and little ends, crank etc but still has a really loud metallic knock like someone hitting it with a hammer. The knocking is about 1/4 of the engine rpm and speeds up with the revs. Can’t for the life of me find what it is. Sounds like somewhere in the middle of the block but hard to tell. If anyone has any idea it would be much appreciated. I’m thinking maybe the oil pump? Thanks.
 
PenelopeLandrover said:
New to the forum, posted this already in the wrong place then found this discussion. I’m rebuilding a series 3 with a J19. The engine has had new pistons, big and little ends, crank etc but still has a really loud metallic knock like someone hitting it with a hammer. The knocking is about 1/4 of the engine rpm and speeds up with the revs. Can’t for the life of me find what it is. Sounds like somewhere in the middle of the block but hard to tell. If anyone has any idea it would be much appreciated. I’m thinking maybe the oil pump? Thanks.
Click to expand...
Does this happen only when you are moving, or with the engine running in neutral as well?
 
It's beginning to sound like you may have to take the engine apart again. Was the crank new or reground, and did you lubricate the big ends before assembly, did you use new bolts for the big ends and did you torque them up? I know these are rudimentary questions that shouldn't be asked of someone who knows their way around an engine but I was a mechanic once and you'd be amazed at the basic mistakes that professionals can sometimes make. Have you gone around the engine with a stethescope or long screwdriver listening for where the knock sounds worse.

Col
 
Colthebrummie said:
It's beginning to sound like you may have to take the engine apart again. Was the crank new or reground, and did you lubricate the big ends before assembly, did you use new bolts for the big ends and did you torque them up? I know these are rudimentary questions that shouldn't be asked of someone who knows their way around an engine but I was a mechanic once and you'd be amazed at the basic mistakes that professionals can sometimes make. Have you gone around the engine with a stethescope or long screwdriver listening for where the knock sounds worse.

Col
Click to expand...
If it is at a different frequency to engine speed, it could well be that the previous posts about something driven off the camshaft are accurate.

However, as these things are prone to knocks and rattles, it could be from almost anywhere, and transmitting to the area of the engine.
Which is why I asked if it happened with the vehicle stationary and in neutral, rule out any trans issues.
A stethoscope can be useful for diagnosing knocks. It could even be the bonnet on one of the wings if the bonnet bushes are knackered.
 
And yes, crank was reground, shells lubed, new bolts all torqued correctly. It’s a real pain in the proverbial. Tried listening all over and I’d say in the middle somewhere. Really frustrating!
 
I'm not very familiar with landy Diesel engines, is the oil pump in the sump? Apart from the knocking does the engine start, tickover and rev nicely? Have you looked carefully all around the engine to make sure something isn't banging against it? I had a funny knocking noise and it turned out to be a mud shield knocking against the wing, didn't do it at certain revs.

Col
 
Colthebrummie said:
I'm not very familiar with landy Diesel engines, is the oil pump in the sump? Apart from the knocking does the engine start, tickover and rev nicely? Have you looked carefully all around the engine to make sure something isn't banging against it? I had a funny knocking noise and it turned out to be a mud shield knocking against the wing, didn't do it at certain revs.

Col
Click to expand...
Oil pump is in the sump on a 19j, and all the other engines derived from the 2,286 block.
 
PenelopeLandrover said:
And yes, crank was reground, shells lubed, new bolts all torqued correctly. It’s a real pain in the proverbial. Tried listening all over and I’d say in the middle somewhere. Really frustrating!
Click to expand...
Did you do this yourself, or was it done by a pro reconditioner?

And have you looked at the vacuum pump at all?
 
Is there any chance of recording the knock with your phone and posting on here the actual sound might give more of a clue. If all else fails just drive it until it becomes apparent what the problem is.

Col
 
You might be able to narrow the noise source down by slackening in turn, each of the injector feed pipes at the injector.
If the noise changes or stops you would know that it is cylinder related and indeed which one.
 
Turboman said:
Did you do this yourself, or was it done by a pro reconditioner?

And have you looked at the vacuum pump at all?
Click to expand...
When you say vacuum pump I assume you mean for the brakes? This is a single line system, no servo, so the vacuum pump has had the vanes removed and is pretty silent.
 
TR3a said:
You might be able to narrow the noise source down by slackening in turn, each of the injector feed pipes at the injector.
If the noise changes or stops you would know that it is cylinder related and indeed which one.
Click to expand...
I tried this and there is no change in sound for each injector other than they all slow the engine
 
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