Got a 4.6 with a tick which I can't seem to pin down. Not present when cold but quickly starts ticking.

What I did hear with my stethoscope as well as the tick is a kind of rumbling noise towards the front of of the sump. Not present at the rear of the sump but the tick is.

Any ideas anyone before I pull it apart?

 

Could that rumbling sound be the oil pump? Sounds like valve train, lifter/rocker. Possible exhaust leak.
Headers? Wow.

 

Hey Lisa, didn't think about the oil pump; thanks.

I though the rockers were the issue and when I pulled the covers off there were a few rockers without the steel inserts. So, it's got new roller rockers and pushrods. I also checked the lifters and the cam lobes and there wasn't any wear at all.

 

Roller rockers? Have you done Stage 2 porting yet?
I want to do that inline T-stat mod too. Pulling my valve covers this weekend, wonder what I will find.

 

The heads are fully gas flowed and the headers are port matched.

In the inline stat is a great mod, never see temps above 90c

 

Awesome!

 

Get an elm327 bluetooth dongle off of Amazon, get a free torque app for an android (any ebay android phone will work) and watch the temps to determine exact temperature the ticking starts. If it is above 190, the bypass thermostat with a 180 stat will fix the ticking. If it is below 190, check the oil pressure during a warm up cycle, see what oil pressure the ticking starts.

There are two possibilities. Ticking is lifters or rockers due to low oil pressure, or ticking is due to slipping liner. Low oil pressure could be a walked cam bearing or cracked oil pump. Dropping oil pan lets you look at cam bearings, and you have to do that to get to the oil pump if the cam bearings are all in place.

Slipping cylinders can be fixed by pinning the cylinders, relatively easy with a right angle drill.

 

Thanks Extinct.

I've got the elm327 and I use the Torque app.

So:

1) definitely got an exhaust leak
2) ticking started at 95 and got louder until about 125

So, that plus the rumbling sound at the front of the engine low down (Lisa suggested) points most likely to the oil pump. Or, could a walked cam bearing cause the rumbling sound?

 

95 c, or 95 f? my guess is the rumbling sound is one of the accessory pulley bearings,, they've my kind of make that sound. Drop the accessory drive belt off with the engine cold and start it up and see if you hear that sound. If it's 95 C I would throw a 180 thermostat in that bypass thermostat you've got and see if the sound goes away. Either way you probably need to do an oil pressure test at this point

 

He's from Australia, working with Celsius. I think the sound in the video is from his stethoscope.