J19 loud knock

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PenelopeLandrover

Member

Posts

13

Location

Gloucester

• Mar 6, 2021

• #1

New to the forum, 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.

 

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R

rob1miles

Well-Known Member

Posts

3,565

Location

Slough and Bath

• Mar 8, 2021

• #2

Piston hitting a valve?, Pushrod out of place? Any valve is once every 2 rotations

 

adrian hogg

Well-Known Member

Posts

410

Location

WEST MIDLANDS

• Mar 19, 2021

• #3

injector sticking? is it smoking too

 

steve2286w

Well-Known Member

Posts

4,597

Location

monkeyangerland

• Mar 20, 2021

• #4

Agree maybe an injector , they can knock loudly if the spray pattern not correct, you can slacken the union nuts one by one while engine running to see if noise stops , wear ppe
When you were rebuilding did you turn over engine by hand at intervals as crank was built up to check for free turning
Nice looking rebuild BTW

 

L

lynall

Well-Known Member

Full Member

Posts

25,921

Location

Kent

• Mar 20, 2021

• #5

Head skimmed? hot spots skimmed to match? hot spots tight? correct pistons? new piston protrusion checked against old ones? pump timing over advanced?