Warped Block 1Fz-Fe (1 Viewer)

[eche]

This sucks. I had a cracked head and I am building a new head. No overheating occurred. Now, I found out my block is warped 0.006" lower at #6 end, passenger side. This warpage seems to be consistent with the cylinder head crack (on top between #4 and #5, exhaust side). I had rebuilt the engine over a year ago, 17,500 miles. Block was decked and cylinders only needed honing. Head was machined with a valve job.

What could cause the block to warp?

I thank this forum for all the past and future support.

 

[azusa]

If you heated it up enough anything can warp, that said I have yet to see one warped, pitted yes but not warped. Did you measure for straightness after decking?

 

[60 toy ota]

I know you said it didn't overheat but these heads rarely crack and the block warping is even less common. Heat is the only thing that I can think of that would do that. Improperly torquing the head could crack in but probably long before 17k

 

[Fj80oregon]

Never seen a warped block on 25 plus rebuilds. Not saying it can’t happen would be an anomaly for sure. You going to have it machined?

 

[eche]

If you heated it up enough anything can warp, that said I have yet to see one warped, pitted yes but not warped. Did you measure for straightness after decking?

I didn't have a precision straight edge at the time. I think I just eye-balled it with a 2-foot Stanley level; having faith in the machine shop.

 

[eche]

I know you said it didn't overheat but these heads rarely crack and the block warping is even less common. Heat is the only thing that I can think of that would do that. Improperly torquing the head could crack in but probably long before 17k

My block #'s don't match, so the block is not original. I've had this truck for 18+ years. Wondering if the cylinder head was milled one too many times. I can measure and compare with the new head.

 

[azusa]

I didn't have a precision straight edge at the time. I think I just eye-balled it with a 2-foot Stanley level; having faith in the machine shop

What are you measuring it with now?

 

[eche]

Never seen a warped block on 25 plus rebuilds. Not saying it can’t happen would be an anomaly for sure. You going to have it machined?

Yes. I am looking at machining and a thicker head gasket once I get out of this depression. Not excited about pulling the motor again. I wonder if the previous machine shop messed up last time. It's low .003 to .006 at the #6 end of the block.

 

[eche]

What are you measuring it with now?

I now have a precision straight edge.

 

[Kernal]

Consider also checking your straight edge against another (or have the machine shop check theirs). They can get damaged.

The first straight edge I purchased years ago wasn't precision, then the replacement they sent wasn't either. These were Starrett brand which has a good reputation but IIRC after talking with the company they said they had farmed out production of their straight edges to someone else and had a bad batch. Might have been a one off (or two off). FWIW

 

[eche]

Consider also checking your straight edge against another (or have the machine shop check theirs). They can get damaged.

The first straight edge I purchased years ago wasn't precision, then the replacement they sent wasn't either. These were Starrett brand which has a good reputation but IIRC after talking with the company they said they had farmed out production of their straight edges to someone else and had a bad batch. Might have been a one off (or two off). FWIW

I will check it. At least flip the straight edge around and see if I get the same measurements. Thanks!

 

[mudgudgeon]

I will check it. At least flip the straight edge around and see if I get the same measurements. Thanks!

If you turn it around, end for end, it won't change a bend in a straight edge.

If your straight edge has two straight edges, roll it over and try with the other edge

 

[mudgudgeon]

My block #'s don't match

Numbers don't match what?

Pretty certain frame and engine numbers aren't matched from the factory.

 

[Fj80oregon]

Numbers don't match what?

Pretty certain frame and engine numbers aren't matched from the factory.

The only vin # on a 1fz is a stamped plate on the head. Which is removed if you have a supercharger.

 

[azusa]

Yeah, I had a machine shop deck a block and bore the cylinders, that deck was so fkn wavy that you could go surfing on it lol. This cylinders we're bored .006 over spec. This is a common thing with machine shops, especially in my area. I reckon to find a high quality machine shop would cost more than a factory short block and new bare head. Highly recommend to go with the factory short block and buy yourself a brand new head, unless you like headaches.

 

[eche]

Yeah, I had a machine shop deck a block and bore the cylinders, that deck was so fkn wavy that you could go surfing on it lol. This cylinders we're bored .006 over spec. This is a common thing with machine shops, especially in my area. I reckon to find a high quality machine shop would cost more than a factory short block and new bare head. Highly recommend to go with the factory short block and buy yourself a brand new head, unless you like headaches.

Yeah. I can see-saw the straight edge on the worst part of the block. I did get a new head from Capo Valley Toyota.

 

[eche]

Numbers don't match what?

Pretty certain frame and engine numbers aren't matched from the factory.

That would be good. I thought the block was changed.