Experts needed: Timing belt running toward engine

[Bri7man]

To paraphrase The Oracle from The Matrix I hate to bring good people bad news Mike, I learnt by accident after trashing my original mint GE block by over torquing the bolt

(could never understand why it had horrible blow by on the dyno at even low boost)

Also for the belt tension just buy a fresh spring from Toyota (they're cheap) and let it set the tension per the TRSM then pull the bolt down to 36 ft/lbs and you're good to go.

Could any less than 36 ft/lbs do the trick IJ, or does it have to be done up that tight?

In regards with your experience with the #1 cyl wall warping.

 

[IJ.]

Could any less than 36 ft/lbs do the trick IJ, or does it have to be done up that tight?

In regards with your experience with the #1 cyl wall warping.

36 is the spec for that fastner and I'm sure Toyoyta took block deflection into account when they specced it.

I always have 7M blocks bored and honed with the tensioner bolt done up so it's a non issue on my engines

 

[Bri7man]

oh man I dropped off my pistons at 3 today hopefully they didn't get to boring yet:aigo:

 

[Zumtizzle]

it's honing where you have to worry about it.

 

[giterboosted]

Brand new tensioner on my part btw but not a new spring, could that be my issue?

 

[supraguru05]

could you get some pictures with everything on the engine. maybe from the side and front to see if anything looks off.

 

[whitemike]

could you get some pictures with everything on the engine. maybe from the side and front to see if anything looks off.

@who? This doesn't seem to be my thread anymore

 

[TurboStreetCar]

Was the block ever machined without the timing cover being machined? Theres a little spot on the pass side of the bock where the head meets the block, you can actually feel if there is a ridge where the timing cover meets the bock. If its higher than the deck surface it could cause your head to be leaning back in a sense and making the belt ride back.

This would also cause a serious oil leak at the timing cover.

 

[whitemike]

Well guys, no definite answer so I'm just replacing parts, and hoping that does the trick. Tensioner, spring, belt (of course), crank timing pulley.

 

[Supramk389]

Good luck! Mine creeps foward towards the rad to the end of the cam gears...I gotta check the guide on the crank pulley, never knew there was opne there!

 

[Bri7man]

Mine creeped to the timing plate a couple of months ago and started to shred itself after 4 quartermile runs.. But a sheared bolt had broke the crank pulley guide clean off and I know I didn't put it on as straight as it could be.

This kind of thing has got to be really annoying.. Hope you figure out what's going on.

 

[whitemike]

Thanks for all the responses guys. Tensioner is in, lower timing cover is on, intake mani bolted up, almost ready to drop in. My goal is to get it in Monday night, and have it running Tuesday night

 

[sk6471]

My first 7m picked up a nasty shriek right after I bought it. After a few months of trying to figure out what it was, I took it to a mechanic. The front lip of the crank timing pulley had broken off and the timing belt had worn a groove in the lower timing cover.