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1962 messages, Last post on Jun 11, 2009 at 3:33 PM
You are in the Toyota Tundra Forum. Your Host is kcram
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Replying to: msalsbury (Oct 03, 2008 5:18 am) I have a 2008 Tundra w/ the 5.7 liter as well. I've done some research on the 5.7 engine knock. Toyota utilizes "short skirt" pistons. When the piston is on the power stroke (4 stroke engine) the short skirts causes the piston to rock back and forth (slightly) in the cylinders. When it is cold out side the knocking is loudly due to the metal of the pistons and cylinder walls being smaller. As the engine warms up the metal the gaps between the metal surfaces decreases. This helps quiet the knocking but not completely. My 5.7 knocks as well, if that makes you feel any better. Obviously, I have not heard how loudly your Tundra's engine is knocking. I can tell you that mine is quite loud when the abient temp. is 40 degrees or less. I have spoken to my local dealer and their responce matches what I have found out through Toyota Motor Corp. myself. Many manufactures use short skirt pistons in high performance engines. Motorcycle manufactures have used this technology for years without any failures. Honda, Yamaha, Suzuki and Kawasaki use this technology for lighter wieght pistons in their sport bikes to allow higher rpms for higher peak horsepower. I can only guess that Toyota has done the same with the 5.7 liter V8. (Toyota owns a good portion of Yamaha Motor Corp.) Yamaha builds some engines for Toyota.
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Replying to: 1972ck (Jan 05, 2009 12:43 pm) |
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| I just joined this forum,and have read a lot of interesting stuff on the 5.7iforce,I have a 07 tundra limited crew max 5.7 with 19971 miles on it an I couldn't be more pleased with it.The only time it goes to the shop is to have the oil changed every 5000 miles. | |
The noise that 75% of 5.7 liter engine owners hear for a few minutes after startup is piston slap plain and simple. It is impossible to say without testing and inspection what is causing the slap. It could be the cylinder(s) or piston(s) are out of tolerance. The piston or block could have a manufacturing defect. The piston or block could be poorly engineered. I am sure Toyota knows because the TMC regional rep admitted to me  they no longer build the engines like they did in 07 & 08. Typically, a loose piston (if not broken) causes excessive wear of the piston and cylinder wall resulting in increased blowby. This in turn exacerbates the problem further because the loose piston cannot transfer heat to the cylinder adequately. What you have is an engine that, providing something doesn't actually break, wears out much earlier than it should. In a State where smog inspections are done it much more likely that the vehicle will fail the emissions test long before it should have, not to mention degraded performance. Toyota no doubt takes the stand that as long as it lasts at least 100,000 miles, the length of the extended warranty, then who cares. One of the reasons we all bought a Toyota was the reputation of their products for durability which equates to resale value. That expectation no longer applies to the 07 & 08 trucks not only because something is wrong with them but because TMC has not the honor to fully admit the problem and fix it. I am exploring the potential for legal action as this problem is becoming widely recognized in many forums across the Internet and it is time for Tundra owners to get some satisfaction from the manufacturer with respect to repairs and warranty coverage of this issue. The owners of the 3.0 liter T-100s and Tacomas with cast iron blocks and aluminum heads that all had bad head gaskets were ignored until they resorted to legal action. Toyota finally replaced all the head gaskets but unfortunately trucks with those engines are now almost worthless because everyone knows you can't keep a head gasket in one. Is that the future of our 07 & 08 5.7 liter Tundras?
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Replying to: kl67 (Apr 10, 2008 8:31 am) It take at least 15 mintues of driving to get the knock out . Sounds like a diesel Please if you could email me at : msportraits  salsburystudio.com then I can discuss this with your dealer |
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Replying to: kl67 (Mar 17, 2008 6:57 am) Can you tell ne the name of the dealer ( and address or were it is ) that replaced your engine on your 5.7 L . My dealer just says " its normal " . It take at least 15 mintues of driving to get the knock out . Sounds like a diesel Please if you could email me at : msportraits salsburystudio.com then I can discuss this with your dealer |
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Replying to: kl67 (Feb 21, 2008 9:18 am) My dealer just says the engine knock (the diesel sound that last at least 15 minutes or more before it quiets down but does not go away ) they say " its normal " I even listened to my neibours tundra and his does not do that
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Replying to: Mojaveman (Jan 24, 2009 8:54 pm) Chevrolet, Ford, Dodge, Isuzu, Internationals, Freightliners? others? how many individuals do you think will not purchase remaining 2008s after reading this discussion/ being educated by toyota engineers as to what is progress of investigation / transparency / open dialogue, is this a sticker for purchase, resale values, detriment to investments for the stockholders? it is design / manufacturing / engineering / or business problem? why does it happen on some as opposed to others? what type diagnostics are needed to discern this problem on others that may have not heard? Do the vehicles in question have similarity ,,time date manufactured? one run two runs,,what type numbers quanify recall? reason for lower prices in Texas? discounts showing tundratalk.net 21.56% to 26% realcartips.com will the discount grow greater as time wanes on? will anyone purchase 2009s 2010s for fear that the problem will manifest without follow up? a potential custome wants to know these things in advance, having nvever worked with toyota before. what has changed with Toyota and spirit of excellence? |
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Replying to: msalsbury (Jan 28, 2009 8:51 am) What after the 100,000 mile mark with noise issue being detected prior to 100,000 mile mark>>#1 customer inquiries, #1001 customer inquiries Toyota will Replace Engine with other associated mechanics problems all in Good Faith at What Cost to Consumer? at What Cost to Stockholder? $20k turning into $40k actual cost of vehicle to be determined? Cost benefit Ratio How many actually will notice? How many will actually contact Dealer? How many will actually know that this is Toyota's problem and not consumer? Did you change your oil? Did you change your transmission? You had work done to vehicle outside the Dealership? Does this void the warranty? Free of charge , to consumer, parts and labor ,,handshake,,Moving Forward |
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I'm sorry but those are two of the most unintelligible posts I've ever seen. What language are they written in?
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