2.7L Crankshaft Bolt Loose

Having major engine trouble. As the title says my main pulley has stopped turning. No fan, oil pressure, alternator, nothing. Truck still runs. Made a pinging noise right before and after it happened. I turned it by hand so it is not frozen. Can it come loose? Help me clear some of this up and add your input so that i can wrap my head around what needs done. I've been having trouble with the truck recently and just when i thought it cant get any worse... here we are.

 

Is the engine running when the pulley is stationary?

 

Im guessing the Crank Pulley backed off, or the key between the Pulley and Crank sheared.
The Crank Pulley tailshaft turns the oil pump.


Here is a post my good information.
https://www.tacomaworld.com/threads/2-3rz-oil-system-photo-reference.414616/

 

Sounds like the key sheared on the crank.

I wonder did the timing chain jam to cause this.

Did the crank bolt work loose .

The trick is to figure out just what happened and why

 

Thats what I am wondering. Truck runs fine otherwise even though obviously it shouldn't be ran. I'll give you guys an update when i get it to a shop and can see whats happening.

I did hear through research that the Crank Bolt Had a specified torque rating that has since been changed to a much higher number and maybe after 325k miles it just backed off...fingers crossed anyways...

 

Well tore into it today and found that the bolt seems to have come loose and wiggled out. The threads are stripped on the bolt, but I;m assuming this is from the crank spinning freely around it.


Threaded it in without the pulley and the good threads on the bolt grabbed so I am assuming the crank is good to go. The bolt seems to be brass so I assume it wouldn't damage it too much. I'm gonna order a new bolt but now I am kind of confused because the one I see for the 3RZ 2.7L engine looks different than the one I have. It is possible it was changed since I bought the truck with 270k on it. Kind of resembles one off a 3.0 3VZ. I guess I will order one for the 3RZ unless someone tells me otherwise. Interesting either way...

3RZ crank bolt https://www.yotashop.com/toyota-2rz-3rz-2tr-oem-crankshaft-pulley-bolt-90105-16041/

3VZ crank bolt https://www.yotashop.com/crankshaft...5O6UKhheTsWv-s8FOZhYLUZk0bHFE2DYaAke1EALw_wcB

 

Good eye on the crank bolt not looking original. You know why that would've been removed previously? You know the repair/maintenance of the taco?
Even then if those two pics from the website you linked are pics of OEM crankshaft pulley bolts, the oem one only has threads to about half the length of the bolt. Looks like the one you removed was different. I just wonder why it was opened up before, these 3RZs don't have a timing belt so that crank bolt was likely removed for something, before you got the truck

 

Only theory I have is that it has come loose before and they opted for a bolt with more threads. I did find this guys post where he had the same bolt in a 2.7L. Has the same '11' on the head, but I cant find this exact bolt for sale anywhere online.

 

Never heard of one coming loose that hasn't been removed before. Doesn't mean it couldn't happen, just that I've never heard it. I'd run a new OEM bolt no problem. Are we certain the threads on the crank are fine? Don't wanna find out they buggered the threads in the crank and then railroaded some oversize bolt in.... Gosh I hope not. No way. No way someone would be that much of a monkey brain

 

I threaded as much as I could and seemed fine.I was confident it was a non-OEM bolt until I saw the same one in another thread and now I am second guessing if it really is or not. Any insight is welcome or a link to the correct bolt if you see that mine is wrong. Need to order this tomorrow morning and get the truck going soon.

EDIT:
More pictures of the bolt. It does appear to be pretty worn by the base of the bolt, but none of the threads are damaged near that area.

 

This is the part number for the crank pulley bolt 90105-16041

 

Ended up getting a used harmonic balancer because mine was grooved out where the key fits. I put the new one on and had significantly less play, but still some. I took the chance and drove it 5 hours home. It has held up. Balancer wobbles a little like it always has done while running. It doesnt seem like there should be any play in this pulley if it is all good and right. I have maybe a quarter inch of play and its not timing chain slack because the crank doesnt move when i wiggle the pulley. I want to get in there and inspect/replace the key now that I have access to a shop and tools. Can I access that key if I remove the oil pump?