Help Identify Tick/Knock

[ToyotaMatt]

 

[ToyotaMatt]

 

[Skreddy]

I don’t think it’s heat related as it does it hot or cold and has since the initial startup. Also has completely flushed cooling system, new water pump, radiator and fan clutch, thermostat verified working in varying degrees of water.
Thinner oil could be a culprit, but I don’t see the difference in 40 weight to 50 weight making this noise happen or go away.

Going to pull the pan today and check the rods, then timing cover if nothing obvious found.

 

[Green Bean]

Ben:
I saw a trick the other day where a fellow mechanic was able to temporarily disable the fan. He then used a piece of tissue paper holding it along the exhaust manifold. To the extent there are any leaks, the tissue paper will show movement. Just a thought.
Good luck.

 

[Pighead]

I checked it over really well feeling around and don’t feel anything. I will check again to be extra sure though.

The breeze from a revolving radiator fan will make it difficult (impossible) to feel an exhaust leak.

 

[Skreddy]

The breeze from a revolving radiator fan will make it difficult (impossible) to feel an exhaust leak.

Before I pull the pan I’ll remove the belt and run it checking manifold to head. It’s a brand new remflex gasket and I’ve yet to have one leak but never know.

 

[Pighead]

Before I pull the pan I’ll remove the belt and run it checking manifold to head. It’s a brand new remflex gasket and I’ve yet to have one leak but never know.

I tried a remflex gasket once, i followed their instructions for the torque specs, which were really light, i thought. Did not work for me.

 

[Skreddy]

I tried a remflex gasket once, i followed their instructions for the torque specs, which were really light, i thought. Did not work for me.

I always tighten them more than remflex says. I’ve used them on half a dozen SBC’s, a couple big blocks, ford v8’s and 5-6 F/2F engines and have never had one leak yet.

 

[Skreddy]

Well after a bit of a break here’s where I’m at. Pulled the oil pan and all the rod caps. Crank looks fantastic and measured great with standard bearings, though they weren’t oem so someone has been in here before. Did find some weirdness on the rod bearings and the #1 rod cap had a chunk of metal shaving in it holding the cap open about .010” on one side. Installed new bearings and oil pan back on. Fired it up today and exact same noise. At this point it could be wrist pin, timing gear, who knows. While working on this we actually located a fresh rebuilt engine that the owner was not going to end up using on their project so we are going to swap that in and have this one rebuilt for future use.

 

[fyton2v]

@Skreddy Did you ever dig further into the motor to figure out what was making that noise?

 

[Skreddy]

@Skreddy Did you ever dig further into the motor to figure out what was making that noise?

Not yet. He’s going to take it to a machinist to have it gone through.

 

[estoltman]

I have the same noise. Took it to a local Landcruiser specialist right before Covid hit. He and his crew said it was a wrist pin (engine has less than 2K miles, rebuilt years ago). Said he had the same noise in his engine and put 80K miles on it. Not something I want to do. I can't remember the cylinder # (it was 3 years ago), Will try the wire test. Would a compression gauge indicate if it's gasket leak?