Low Speed Timing Belt Break... Need advice

Broken valve typically takes other things with it. Sometimes piston heads, sometimes rods with that, sometimes the valve guides, the sealing surface etc. Requires removal of the head to repair, potential resurfacing or re-machining damaged areas. Labor is the killer on engine repairs these days. Cheaper to pull the whole lump and put a new lump in usually.

 

Personally I would pull the heads off and have a look. It's not a hard thing to do. You can replace the valve if that one is the only bent one. Don't machine the heads. Toyota doesn't recommend it because you can change the valve timing. If the seat is good just install the new valve and clean the heads. Fhe head bolts are torque to yield and need to be replaced.

 

That’s not off the table. I have never done that before so need to dig into that and see what it entails. I have a feeling that the damage is limited to the right cam and possibly just that #8.

 

Hell yeah. I like this guy!

 

What do you guys think of just getting a rebuilt right head and swapping it out. Of course I would take another close scope of the left side but I’m fairly confident no issues there. Here’s one for $700 on eBay.

https://www.ebay.com/itm/1749095694...jcP847-SLi&var=&widget_ver=artemis&media=COPY

Doesn’t seem so difficult at this point.

 

My confidence would be low due to never having done it before.

That, and after reading the woes in this thread: https://www.tundras.com/threads/multiple-misfires-after-rebuild-fixed.110071/

Where the timing ended up being the root cause, I know I'd need to dig into the service manual to follow instructions on that one, which is not my normal M.O. (or need)

I think @Tim Berframe went through something similar on his '06 which would be similar to yours and may be able to give input, I can't recall if he opted to do his own after similar problems hit him when a mechanic sold him a truck that he "redid the head gaskets on" improperly: https://www.tundras.com/threads/head-removal-with-crashed-valves.128931/

But ... I dunno. I see people on here do things every day at home that impresses me, so ... I'd love to be impressed here too.

 

The more I look at it the more straightforward it seems. I’m already knee deep in it- at this point I’m thinking I should go all the way. There are also some parts trucks locally with good motors where I could probably just pull the head for pretty cheap and slap her on with some new gaskets and bolts.

Almost feels simpler than figuring out the logistics of finding the right mechanic, towing the truck, and the waiting game.

“First time for everything” is how I’ve avoided paying for a mechanic for 20 years I suppose….

 

Your bravery is commendable! I feel positive vibe just visiting this thread!

 

Wait untill you take it apart. The cam should be fine and if it's just a valve just pop a new one in.

Get a shop manual.

 

If they were all that simple everyone would just fix em. Here’s hoping though.

 

I agree this is a job you should DIY if you have the time to do it and the truck isn't your sole means of transportation. As you say, parts trucks are relatively easy to come by in these parts because the frames and bodies have rusted out so they no longer pass inspection -- rendering them almost valueless. First thing I'd do is take the head off and see what's what in there. Is there valve damage? Is there piston damage? Was there any debris from the collision that scored the cylinder walls. With those questions answered and a parts truck in hand, you can assess whether is best repair your current engine with 280K miles or swap the whole engine from the parts truck.

 

I’m going to close the loop on this thread. Found a 4.7 on FB Marketplace with 195k on it for $1000. The seller asked me if I wanted a video of it running as he hadn’t pulled it yet. Long story short after asking- he was willing to swap the motor and replace all of the timing components for an additional $2000. He had it done in two weeks in his spare time. Truck is running like a top again and I couldn’t be happier with how it all worked out. Could have been much worse.

 

Double-check that he routed that crank position wire correctly