I've been lurking around for a while searching and reading up on what might be going on with my 93 T100. This is my first toyota truck, I've worked on a lot of other cars, but I'm having trouble figuring out what is going on. The truck has 137,000 miles, I have only had it a year, bought it from the 2nd owner who sold it because it didn't have the extra cab after owning it a year, but supposedly kept up by the OG owners, no records though. Who knows right? That's what they all say.

Anyway, I was heading up a long steep grade on a 100degree day when the knocking occurred. Initially, I pulled over thinking that I spun a bearing. I had to restart the truck to move off the highway. The truck hasn't lost any power and actually still drives, but makes this terrible sound. It seems to be more toward the front of the engine and toward the top. After reading more and doing some searching I thought Maybe the timing belt slipped a tooth or two? I'm kinda at a loss, I live a long way from town, so I'd rather not tow it all the way to the mechanic to diagnose it and tell me the engine is toast and then tow it all the way home. It is a great truck, but if the engine is done, I'll just find another one I guess. But if is fixable, I'll take a stab at it. I figured you guys have seen a lot more of these engines than me, thanks.
[YOUTUBE]73L4Nk9hAig[/YOUTUBE]

 

Did you try posting your question and video link on the T100 forum in ToyotaNation? There's a guy there, BamZipPow, who can probably diagnose your problem. Sorry I can't help and hope the engine isn't shot. Good luck, Amigo!

 

Wagoneer, based on the occurrence, it sounds like it's coming from the bottom end, probably a rod bearing or damaged wrist pin. Only tearing the motor down would you truly find the culprit. Sorry to be the bearer of bad news.

And gaijin, bam is also a member here.

 

Yup...here I am! Thanks fer posting the video!

I don't git in here as much as I do over at TN...but I will eventually come through the T-100 section.

I would keep it simple at first to see if there is any signs of what might be causing the knocking.

Check the oil fer metal flakes or signs of water contamination. A clean pan to drop the oil would be best. Post photos of any debris you find.

Pull the timing cover off and check the timing marks on the belt and pulleys. Post photos of the marks.

Pull the plugs and shoot photos of the business ends. Probably a good time to check the compression levels on all 6 cylinders, too. Post up the numbers from the compression test.

How good is yer cooling system? How full is the coolant now?

What is yer mechanical abilities skill level? If you need to rebuild the engine, can you or yer friends you know/have do it? How about pulling and replacing the engine? It might have to come down to that...

 

Hey THANK YOU to everyone who helped out! I pulled the truck into the barn and will start simple, but am prepared for the worst... I've rebuilt some other engines, and have been reading up and watching videos on how to tackle this project. Let's hope it is simple. I will report my findings as I tear into this thing. Thanks again.

 

Post up pictures! We love seeing projects, and they can definitely help you figure issues out and get it back together.

 

Did you find out what was going on with the knocking noise? curious now....lol