rebuild time?

infamous209 · May 12, 2011

Ive been hearing about 4.6s needing rebuilds from 115,000-150,000 because the main bearings going out. To be honest if this is true this scares me cause I just crossed into the 117,000 range. So my questions are, is this true? and if so why so early?

duff daddy · May 12, 2011

Think about the statement you just posted, now chew on this. What motor is in a crown vic?? What motor is in 99% of New York, Boston, and LA's Taxi's ????? 4.6 2v motor....now, think of the hours, AND miles on that motor. Well over 150k and average drive time.

Duffy

D3VST8R96GT · May 13, 2011

Yeah, as with most motors it depends on matinence and abuse....

GrnGt · May 13, 2011

A friend of mine has an 02 gt with 215,000 miles on it and has never seen a rebuild or had the heads off the car. He even sprayed 150 shot of nitrous through it when it was at about 180,000 and its still running strong

infamous209 · May 13, 2011

Never thought of it that way. thanks for the heads up and info. I just took that information at face value without thinking it all the way through.

Willis_98GT · May 15, 2011

infamous209 said:
Ive been hearing about 4.6s needing rebuilds from 115,000-150,000 because the main bearings going out. To be honest if this is true this scares me cause I just crossed into the 117,000 range. So my questions are, is this true? and if so why so early?

Mine let go at 126k and all symptoms and sounds pointed to main bearings

GrnGt said:
A friend of mine has an 02 gt with 215,000 miles on it and has never seen a rebuild or had the heads off the car. He even sprayed 150 shot of nitrous through it when it was at about 180,000 and its still running strong

Thats just plain awesome

96npi · May 23, 2011

im about to hit 180,000 and its burning alittle oil but still runs great minus the small coolant leak from the intake just havent had the time to change it out

D3VST8R96GT · Jun 2, 2011

mines going ...but its cause im an idiot lol ...

Jrgunn5150 · Jun 7, 2011

I find blanket statements on all kinds of motors all the time lol. Ever 2.9 Ford will blow a headgasket, every 4.7; Dodge will eat a timing chain cover, etc etc.

I'd be more worried about your intake than anything

vermilion · Jun 7, 2011

true^

Mustang Mark · Jun 13, 2011

i just tore down a 140k mod motor. the main bearings were like brand new, the rod bearings however were slightly worn.

bottlefed97 · Jun 13, 2011

I bought my car with the odometer reading "98,xxx". The guy said the odometer had been broke for a few years, meaning the car had anywhere from 110,000 to 130,000 miles on it.

I sprayed the engine for 3 years with a 125 wet shot of nitrous and drove it everyday to school, work, and everywhere else I went.

It didn't blow up until I decided not to check the oil for 6 months and I ran it straight out of oil :tard: These 2v motors are troopers man! Don't be worried.

infamous209 · Jun 15, 2011

Thanks guys that put my mind at ease a little more!

SRT Handz · Jun 15, 2011

I pulled my NPI motor at 145,000 Miles. The car was running PERFECT before i pulled the motor. I only pulled the motor to swap a PI motor but at 145,000 miles my Stock NPI motor was strong and ran 100% perfect.

My dad's 1999 Grand Marque with the 4.6 NPI motor has 252,000 miles on the clock.... runs perfect.

vermilion · Jun 17, 2011

intakes crack. the most you may see is a little blow by. its common because the rings have real tight clearance from the factory.

Jrgunn5150 · Jun 18, 2011

I was at Mahle the other day, and they have a NPI in their dyno cell they've been beating on for fifteen year's lol. Said it's the most stable test bed of all the next gen V8's

cmsismyname · Jun 18, 2011

my brother puller his NPI at 185k and it was running perfect he just wanted a pi and my dads 98 f150 with the 4.6 has 237k on the
clock and it runs like new

BLCKSTNG96 · Jun 18, 2011

Keep up on maintainence and watch your oil level and you will be fine,I myself have seen more rod bearing failures then anything and they were generally bc of reving the car out while low on oil.

JerZeyStangz · Jun 20, 2011

Make sure your putting quality oil like Amsoil, or Mobil 1. Staying with in the 5w30 range and not going below the oil line on the dipstick and you will be fine. These motors have high tolerances, and tight clearances...Keep it synthetic and at the full line and the car will run forever.