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1Gen-TundraGeneral discussion forum for the 2000 to 2006 Toyota Tundra.
This is a discussion thread titled "what is a 'short block'???", within the 1Gen-Tundra forum, part of the Truck Forums category.
if so, and short block "doing" is common, this may be a sign of a bigger problem with our 4.7 engines. a lot of us have the startup noise and it goes away pretty quick, within a minute or so after starting. the dealers seem to pooh, pooh it and tell everyone it's normal. now were starting to hear that blocks are being replaced.
Block replacement being common? You're blowing this out of proportion. How many Tundras are on TS and how many had engine replacment,you can probably count them with both hands. IMO that's a very good record considering the number of these engines being used.
Toyota and Lexus has been using the same 4.7 engine since 1998 in the Landcruiser/LX470. We (a Lexus dealership) replaced ONE 4.7 shortblock in this time span. This LX470 had over 100,000 miles and the owner hardly ever maintained it. Pretty good track record I'd say.
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Block replacement being common? You're blowing this out of proportion. How many Tundras are on TS and how many had engine replacment,you can probably count them with both hands. IMO that's a very good record considering the number of these engines being used.
Toyota and Lexus has been using the same 4.7 engine since 1998 in the Landcruiser/LX470. We (a Lexus dealership) replaced ONE 4.7 shortblock in this time span. This LX470 had over 100,000 miles and the owner hardly ever maintained it. Pretty good track record I'd say.
Plus, sometimes if the a manufacture suspects they have a serious issue they may want to replace the shortblock so that they can then inspect the item and figure out what is going on. The dealer may have simply been able to replace the rod bearings (as a example) and that may have solved the issue but Toyota wanted to look at the block etc so they had a replacement shortblock provided for this purpose. I know Nissan has done this in the past. Don't know for sure that Toyota has done it but it's a possibility.
Block replacement being common? You're blowing this out of proportion. How many Tundras are on TS and how many had engine replacment,you can probably count them with both hands. IMO that's a very good record considering the number of these engines being used.
Toyota and Lexus has been using the same 4.7 engine since 1998 in the Landcruiser/LX470. We (a Lexus dealership) replaced ONE 4.7 shortblock in this time span. This LX470 had over 100,000 miles and the owner hardly ever maintained it. Pretty good track record I'd say.
Right on Eddie! Besides that Toyo would never do a crank kit, much less just bearings !! Only Nissan would be that stupid Bearing failure is usually caused by contamination(dirt,antifreeze,fuel etc) which is a product of stupid people, 98% of the time. Your info proves that.Toyo has a motor problem? Yeah right!!!
sorry, i wasn't trying to imply that block replacement was a common problem. it was just the first time i had seen anyone definitely link the startup noises on the 4.7 engine to a block replacement. it could have been anything and who's to say the block that was replaced had the same kind of noise on startup as the rest of us? i probably jumped the gun on that one. something i'm prone to do! don't tease the animals, please...
i do know that i've read that a lot of people on TS do have the noise on startup and that ford and chevy have had piston and cylinder issues due to the quality control on their suppliers and related piston slap. the tundra being made in america, it does seem reasonable to have this checked out before the warranty expires if your engines is one of the ones that has the start up noises on cold mornings and it gets worse as time goes on. and stay tuned to see if anything more develops as folks relate their stories.
personally, i have only good things to write about my truck so far (aside from minor issues) and the engine seems very solid and runs great! i didn't even worry about the noise thinking it was normal until i read that some people have it and others don't. that implies something might be different inside some of our engines. it's worth paying attention too, that's all ;-)
Right on Eddie! Besides that Toyo would never do a crank kit, much less just bearings !! Only Nissan would be that stupid Bearing failure is usually caused by contamination(dirt,antifreeze,fuel etc) which is a product of stupid people, 98% of the time. Your info proves that.Toyo has a motor problem? Yeah right!!!
Rod bearings are not that precise of a fit, they are also the last thing to get oiled in most engines. The most common issue for rod bearing failure is oil starvation due to cornering loads (not likely on a truck ) or high rpms with low oil or high oil temps leading to thinning oil. Fuel, antifreeze etc, will exacerbate the issue. I used to change rod bearings on my track car as preventive maintence once a year. I did it with the engine in the car. Your right though. If a bearing spins or is damaged enough for a regular person to notice a simple replacement will never do. But replacing mains and rods with a properly refinished crank/etc is not that hard to do properly nor is it stupid. Bashing Nissan is just silly. As a general rule they make a great engine. With the exception of the most recent Nissan Sentra engine you have to look pretty hard to find a looser in the Nissan engine lineup.
Hey 4 Wheeler
Not to be argumentive but rod bearings are a precision fit, the same as main bearings.If rod bearings fail then the journals should be checked on the thrust side with a micrometer, as well as the mains & the crank thrust .New bearings should be ball" miced"{spell?"] for exact size. Don't care if they are TRW,Michigan or whose brand.If a bearing goes bad then the contamination goes through the complete system, which means it should be torn down, vatted & assembled clean with new parts, in a dirt free place.The oil pump should be inspected because it will be contaminated & if it isn't cleaned or replaced, where are the particles going when the motor is primed, before firing? Some guys don't even prime the system before firing!
Bearings have to be a precise fit for the motor to turn properly.We used a electric motor driven dyno to check the amp draw on every motor to make sure it was spinning free enough.
Just my 2 cents worth
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Not bashing Nissan, just stating a fact about their incompetent work, if in fact they did do the bearing trip!
Hey 4 Wheeler
Not to be argumentive but rod bearings are a precision fit, the same as main bearings.
On the Nissan SR20 I have worked on the Rod Bearings have about 6 grades, the Mains have 12+. The rods can be measured with regular tools, even plastigauge in a pinch. No average shop or person has the tool to measure the Nissan Main bearings to the precission listed in the FSM. You need a Spring Loaded Micrometer of some sort. I don't know exactly what a Nissan Dealer would do with a blown engine. I have a Nissan Mechanic friend who told me that Nissan was "claiming" the QR25DE engines when they had a bunch of issues so that they could figure out the issues. Thats what I was referring to. Funny thing was that really the qr25de long block was not the issue. It was the combination of a close cat/new egr system/adjustable cam overlap that caused the cat to destroy itself and then get sucked back into the engine.
I don't know about all the different grades of Nissan bearings, just different sizes.
I also don't know what" regular measuring tools" are unless it would be calipers, which are not precision.Like I said it takes a ball micrometer to measure bearings.Plasti guage should be used to check clearances after the crank is laid.If someone builds or repairs motors without the use of micrometers to check cylinder wall wear & lower end sizes,
I would say they are asking for more problems, as stated by PERA.
I am sure Nissan inspects their failures if it become a series problem as you said.
I will try to post some pictures of the sprint car to show you what precision engines win !
Have a good one
I don't know about all the different grades of Nissan bearings, just different sizes.repairs motors without the use of micrometers to check
I also don't know what" regular measuring tools" are unless it would be calipers, which are not precision.Like I said it takes a ball micrometer to measure bearings.
Grades=Sizes, They are sold by color for the Rods
I don't know what you are calling a "Ball" Micrometer but the standard micrometer that Machine shops have does not have the precesion to measure the bearings to Nissan FSM standards. Nissan uses a special spring loaded micrometer that puts a even tension on the tool to give very precise measurements. Even NASA Langley did not have a tool that could measure the same tollerances that Nissan uses. This is all way off topic for this thread so why don't we just drop it or PM me if you have any other comments.
If you don't know what a ball micrometer is then obviously you are out of your element, so I agree, lets drop it !
You are being rude. No need for that. I googled it and it's exactly what I thought. I always called it a micrometer, I know there are many kinds. It's not the tool I am referring to. Thats the standard way to measure things. If you knew about Nissans you would know that tool will not do it. But you don't know Nissans.
I believe this was started as a Toyota info post,not Nissan. If Nissan is such a good product why aren't they ahead of Toyota in sales?
I am not being rude, just pointing out your lack of knowledge!
Why don't you follow your own suggestion & drop it!!
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Re: what is a 'short block'???
Re: what is a 'short block'???
Bearing failure is usually caused by contamination(dirt,antifreeze,fuel etc) which is a product of stupid people, 98% of the time. Your info proves that.Toyo has a motor problem? Yeah right!!!
) or high rpms with low oil or high oil temps leading to thinning oil. Fuel, antifreeze etc, will exacerbate the issue. I used to change rod bearings on my track car as preventive maintence once a year. I did it with the engine in the car. Your right though. If a bearing spins or is damaged enough for a regular person to notice a simple replacement will never do. But replacing mains and rods with a properly refinished crank/etc is not that hard to do properly nor is it stupid. Bashing Nissan is just silly. As a general rule they make a great engine. With the exception of the most recent Nissan Sentra engine you have to look pretty hard to find a looser in the Nissan engine lineup.
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