Toyota Rav4 2AZFE Stripped Head Bolt Repair Part I
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Date: 2020-08-05
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Comments and reviews: 9
Peter
Why do so many of these head bolts strip - good question. The rule of thumb for a steel fastener threaded into aluminium is that the thread engagement should at least 2-3 thread diameters for the joint to develop full strength when properly torqued. For a fastener going into steel, it is about one diameter (i. e. the thickness of most nuts is just about one diameter) because steel is stronger than aluminium
From what Eric showed, the bolt appeared to be engaged to around three thread diameters and so I suspect that the bolts were either over-torqued at the factory or the metallurgy of the aluminium blocks was not up to snuff (ie. it was too soft.
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Why do so many of these head bolts strip - good question. The rule of thumb for a steel fastener threaded into aluminium is that the thread engagement should at least 2-3 thread diameters for the joint to develop full strength when properly torqued. For a fastener going into steel, it is about one diameter (i. e. the thickness of most nuts is just about one diameter) because steel is stronger than aluminium
From what Eric showed, the bolt appeared to be engaged to around three thread diameters and so I suspect that the bolts were either over-torqued at the factory or the metallurgy of the aluminium blocks was not up to snuff (ie. it was too soft.
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Richard
Someone may have mentioned this already, but with aluminum heads and blocks, if an engine overheats, there is far more expansion in the aluminum, and with both being aluminum, it can sometimes pull threads.
On a case iron block with aluminum heads, you typically won't see this since the thread is in the cast iron and it has less expansion due to heat.
With cast iron head and block, you will typically never see threads pulled due to heat expansion.
Way late to the party on this one. :)
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Someone may have mentioned this already, but with aluminum heads and blocks, if an engine overheats, there is far more expansion in the aluminum, and with both being aluminum, it can sometimes pull threads.
On a case iron block with aluminum heads, you typically won't see this since the thread is in the cast iron and it has less expansion due to heat.
With cast iron head and block, you will typically never see threads pulled due to heat expansion.
Way late to the party on this one. :)
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Dennis
A friend of mine bought a Camry that needed a head gasket job. I saw your video but he took the car back so I didnt have to try it. Thank you and thank God I didn't have to get stuck with that job and my buddy didn't get stuck with the stripped head bolt thing that Camry, Im guessing probably had. Also everybody get saved and stuff in case this Corona virus thing kills us all.
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A friend of mine bought a Camry that needed a head gasket job. I saw your video but he took the car back so I didnt have to try it. Thank you and thank God I didn't have to get stuck with that job and my buddy didn't get stuck with the stripped head bolt thing that Camry, Im guessing probably had. Also everybody get saved and stuff in case this Corona virus thing kills us all.
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Joyce
This was a great video. Thank you for sharing this. Its nice to see all of the steps. Also, thank you for keeping it real from admitting at the beginning that you were nervous, the three phone calls from the kiddos, dropping the plastic drill bit guide. oh, and actually reading real directions. Truly an inspiration!
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This was a great video. Thank you for sharing this. Its nice to see all of the steps. Also, thank you for keeping it real from admitting at the beginning that you were nervous, the three phone calls from the kiddos, dropping the plastic drill bit guide. oh, and actually reading real directions. Truly an inspiration!
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JayCarl
In states where cost of living is low I can see how you can make your living like this. Here in California it's not possible. Most mechanics know this and take advantage. Eric and other YouTube Automotive greats have taught me how to do 90% Of my automotive repair work. I cannot say thank you enough for that.
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In states where cost of living is low I can see how you can make your living like this. Here in California it's not possible. Most mechanics know this and take advantage. Eric and other YouTube Automotive greats have taught me how to do 90% Of my automotive repair work. I cannot say thank you enough for that.
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Larry
Generic cutting fluid/oil is generally designed to cut ferrous metals. WD-40 is actually a very good cutting fluid FOR ALUMINUM. I would not use a penetrating oil like Pyroil as an aluminum cutting fluid. The BEST aluminum cutting fluid is Tap-Magic.
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Generic cutting fluid/oil is generally designed to cut ferrous metals. WD-40 is actually a very good cutting fluid FOR ALUMINUM. I would not use a penetrating oil like Pyroil as an aluminum cutting fluid. The BEST aluminum cutting fluid is Tap-Magic.
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Redrooster
Most torque wrenches are not calibrated properly from new! That's why you get these super tight problem bolts. There is a video here on YouTube on how to calibrate your Toque Wrench using a cheap digital luggage weigher and a vice.
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Most torque wrenches are not calibrated properly from new! That's why you get these super tight problem bolts. There is a video here on YouTube on how to calibrate your Toque Wrench using a cheap digital luggage weigher and a vice.
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Steve
We will be coming out the oil pan in a little bit! That made my night I almost fell out of my chair laughing thanks Eric I needed that I was thinking the same thing watching how deep that drill bit went!
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We will be coming out the oil pan in a little bit! That made my night I almost fell out of my chair laughing thanks Eric I needed that I was thinking the same thing watching how deep that drill bit went!
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ferndog1461
My Camry 2004 2azfe, has 135K on the odo. It was rebuilt ( pistons ) by Toyota at 69K, under warranty. It is burning coolant. I am thinking of having a shop install a rebuilt engine.
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My Camry 2004 2azfe, has 135K on the odo. It was rebuilt ( pistons ) by Toyota at 69K, under warranty. It is burning coolant. I am thinking of having a shop install a rebuilt engine.
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