I can't sell my truck.

J88logue · Nov 26, 2013

So much confusion in here......

Rich91710 · Nov 26, 2013

BamaToy1997 said: ↑

OK, I found this information on replacing the cylinder head. This does verify that the engine is in fact an interference engine as Toyotacerttech has indicated! I always like to see something in print before blindly accepting it. And here it is. A notice when replacing the cylinder head during an engine rebuild.
Click to expand...

And that is in keeping with Toyota standard practice.

For the most part, chains go into interference engines and belts go into non-interference engines. Some exceptions, such as the 4.7, but that is a Lexus design so a smooth, quiet engine was a requirement.

Honda is really bad about putting belts into interference engines.

Rich91710 · Nov 26, 2013

DriverSound said: ↑

So normally the 1GR-FE engine is a non-interference engine BUT if you install the crankshaft incorrectly then the valves and pistons can come into contact, correct?
Click to expand...

The definition of a non-interference engine is one where the camshaft can be rotated with a piston at TDC and not make contact.

No engine "interferes" when the camshaft is installed properly oriented with the crank, though some engines may make contact when run to RPM levels above their design due to rod stretch.

4x4Runner · Nov 26, 2013

BamaToy1997 said: ↑

Hm. I am looking at it right now for the 2005 1GR-FE engine (OP has a 2005 according to information) and the Toyota repair procedure says nothing about it being an interference engine. It says "NOTICE: Keep the camshaft level while it is being removed. The camshaft thrust clearance is very small and failing to keep it level could crack or damage the cylinder head journal surface, which receives the thrust. This could subsequently lead the camshaft to seize or break. Perform the following steps to avoid such problems" but that has nothing to do with valve/piston interference. It has to do with the camshaft thrust clearance and bearing caps.

Interesting that there has been more than one engine rebuild that has resulted in a timing chain being broken. I am curious. Chains do not normally just "break" like that. I am beginning to think that perhaps inferior brands are being used, instead of Toyota brand in this case?

OK, I found this information on replacing the cylinder head. This does verify that the engine is in fact an interference engine as Toyotacerttech has indicated! I always like to see something in print before blindly accepting it. And here it is. A notice when replacing the cylinder head during an engine rebuild.

"NOTICE: Installing the crankshaft at the wrong angle could cause the piston head and valve head to come into contact with each other when installing the camshaft. This could cause damage, so always set the crankshaft at the correct angle."
Click to expand...

tacomataco2 said: ↑

Someone should find out concretely if the engine is an interference or not.. Cuz if its not i'd not go back to that dude
Click to expand...

See above.

DriverSound said: ↑

So normally the 1GR-FE engine is a non-interference engine BUT if you install the crankshaft incorrectly then the valves and pistons can come into contact, correct?

So basically if you've never messed with the crankshaft to begin with on a non-rebuilt engine and your chain breaks, there should be no valve/piston contact.
Click to expand...

No it's not normally a non interference engine. The definition of the non interference engine and interference engine is that in a non interference engine with the crankshaft spinning there is enough clearance between the valves and piston if the camshaft stops spinning. In an interference engine However, interference engines usually sustain damage if synchronization between the crankshaft and camshaft(s) is lost allowing the piston and valve to collide causing damage and most likely very expensive repairs for the vehicle owner.

The 1GR-FE is classified as a interference engine and if the timing chain breaks and the crankshaft is still moving then pistons are coming in contact with valves in one or more cylinders.

Jimmyh · Nov 27, 2013

And it ain't going to be pretty... or cheap.

DriverSound · Nov 27, 2013

ForeRunner said: ↑

See above.

No it's not normally a non interference engine. The definition of the non interference engine and interference engine is that in a non interference engine with the crankshaft spinning there is enough clearance between the valves and piston if the camshaft stops spinning. In an interference engine However, interference engines usually sustain damage if synchronization between the crankshaft and camshaft(s) is lost allowing the piston and valve to collide causing damage and most likely very expensive repairs for the vehicle owner.

The 1GR-FE is classified as a interference engine and if the timing chain breaks and the crankshaft is still moving then pistons are coming in contact with valves in one or more cylinders.
Click to expand...

Thank you. At least it's chain driven. I have not seen a broken chain under 180K miles. Honda on the other hand is a different story with their belts.

.jake · Nov 27, 2013

Rich91710 said: ↑

The definition of a non-interference engine is one where the camshaft can be rotated with a piston at TDC and not make contact.

No engine "interferes" when the camshaft is installed properly oriented with the crank, though some engines may make contact when run to RPM levels above their design due to rod stretch.
Click to expand...

He said "Rod Stretch"

DriverSound · Nov 27, 2013

.jake said: ↑

He said "Rod Stretch"
Click to expand...

Captain Spaulding!

Rich91710 · Nov 27, 2013

.jake said: ↑

He said "Rod Stretch"
Click to expand...

http://personal.linkline.com/rlockyer/llybad.wmv

Okay... a little propane was involved as well....

They never found the oil filter. #8 piston went through the block.

blake5995 · Nov 27, 2013

dont get down on your self man. I just rebuilt my engine at 250,000. then spent a couple more times taking it in and out to fix oil leaks and such. Now i broke the end off my crank and just pulled it again and a nother $1000 in parts and now it is coming out again tomorrow morning to fix some other problems that were not caught before. I will never sell my truck though because of it....

hualampeter · Nov 28, 2013

When I get my truck back, I will decide if its worth keeping. I don't wan't to keep forking out money to fix problems that was not my doing. Plus, since it's a 2005, I've been thinking about the rusted frames that some TW members here has encountered. I think I might just sell it and save up for a new Tacoma. THanks for your guys insight and suggestions, and happy Thanksgiving

Rich91710 · Nov 29, 2013

San Jose California? I don't think you need to worry about rust unless you live right on the water or trailer a boat to a salt-water marina.

Worst we get is some light surface rust... if they aren't salting the roads, your frame will last just fine.

hualampeter · Dec 12, 2013

Update: Passenger side valves are bent. Mechanic is replacing the whole head on the passenger side.

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