Hi Scotty. Hope you're well. I few months a go i was in a bind and needed a small truck but didn't have a lot of cash so i bought a 3.7 2004 Dodge dakota with 130k miles on it. The engine was dry and there was no evidence of oil leaks However after buying it i noticed it was overheating and letting out a puff of gray smoke when starting it hot. Upon inspection I noticed that the radiator was SHOT so I flushed the engine coolant and replaced the WHOLE cooling system, radiator hoses and pump and thermostat. Then I ran about 4 thin oil changes trough the engine about a week apart to clean it out some. Then i put in some synthetic for high mileage that included some seal conditioner. I have since replaced the hub assemblies and PCV, TPS and IAC valves and all the transmission fluid. The truck is now running cool and smooth and the little gray puff of smoke is gone. However given the fact that the previous did not maintain the truck properly , my question is...what am i looking at in terms of life expectancy on that engine is it possible to get another 100k out of it? Thanks

Comments (3)
No. 1-3
JustSomeOldNoob
JustSomeOldNoob
PowerTech
PowerTech said: Nearly an impossible question to answer with any accuracy as we can't see the vehicle and don't know its history. However i will add some info. The 2004 is actually one of the better years for the 3.7L , (if it truly is a 04) as the 2005, and later 3.7 engine was treated to numerous economy and idle-quality changes, with a new cam profile, lash adjusters, rings, among other things. There are several reports of the post 2004 3.7 and 4.7 engines developing lifter (lash adjuster) failures. in particular the internal springs would break and the lifter (or lash adjuster) would collapse and the rocker arms would in turn fall off due to that This was recorded as happening mainly on the number 6 and 4 cylinders. The cause for this has not been absolutely confirmed yet but there is speculation of lubrication port failures and hotspots in those areas. This problem has mostly been reported with 2008 models. Now with regard your 2004 3.7 I would go out a=on a limb and speculate that that blue "puff" on hot start was most likely caused by a leaking valve guide as you stated the oil with the seal treatment seems to corrected the problem (at least visibly) If your engine is sounding and performing well, and you transmission is working good (ESPECIALLY IN REVERSE) and you are not noticing oil burnoff and you are keeping the truck engine cool, and the oil and filter changed every 2 to 4000 miles, then i would guess you could probably pull another 60k out of the truck wich is an average of 3 to 5 years depending on driving habbits. Getting another 100k is along shot , but might be achievable if you really baby it. ;) Anyway, that's my 2 cent worth.

Helpful Answer. Thank You.

PowerTech
PowerTech

Nearly an impossible question to answer with any accuracy as we can't see the vehicle and don't know its history. However i will add some info. The 2004 is actually one of the better years for the 3.7L , (if it truly is a 04) as the 2005, and later 3.7 engine was treated to numerous economy and idle-quality changes, with a new cam profile, lash adjusters, rings, among other things. There are several reports of the post 2004 3.7 and 4.7 engines developing lifter (lash adjuster) failures. in particular the internal springs would break and the lifter (or lash adjuster) would collapse and the rocker arms would in turn fall off due to that This was recorded as happening mainly on the number 6 and 4 cylinders. The cause for this has not been absolutely confirmed yet but there is speculation of lubrication port failures and hotspots in those areas. This problem has mostly been reported with 2008 models.
Now with regard your 2004 3.7 I would go out a=on a limb and speculate that that blue "puff" on hot start was most likely caused by a leaking valve guide as you stated the oil with the seal treatment seems to corrected the problem (at least visibly) If your engine is sounding and performing well, and you transmission is working good (ESPECIALLY IN REVERSE) and you are not noticing oil burnoff and you are keeping the truck engine cool, and the oil and filter changed every 2 to 4000 miles, then i would guess you could probably pull another 60k out of the truck wich is an average of 3 to 5 years depending on driving habbits. Getting another 100k is along shot , but might be achievable if you really baby it. ;) Anyway, that's my 2 cent worth.

dirty dan
dirty dan

Sad to say probably not