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Car Forum / Dodge / Dodge Trucks / July 200598 5.9L bearing problem
The 5.9L motor in my 98 2500 quad cab has developed a lower end knock. It's most noticeable on start for a few seconds but it's always there just much quieter. This truck has about 100K on it. My thought is a rod bearing but I guess it could be a main bearing. Other than this the motor runs strong. We pull a 5000 pound trailer about 200 miles every weekend for several months. We're looking to possibly be pulling for longer distances next year. Are there any reasons to not putting rod and/or main bearings in? Or is a short block the only way to go? Thanks for any suggestions. > The 5.9L motor in my 98 2500 quad cab has developed a lower end knock. > It's most noticeable on start for a few seconds but it's always there [quoted text clipped - 9 lines] > > Thanks for any suggestions. The change in sound you are describing sounds like a main bearing. The problem is that if a bearing has failed, the chances are pretty good that the crank journal that the bearing supports or rides on is also damaged which will require removal of the crank for machining. While this can be done with the engine in the vehicle in many cases, it really defines PITA to do it. If it was a main bearing, you also have to check the block for damage from this as well and if it is, out it comes. If you intend to keep the truck for a while and with the work load you put on it I would suggest going with a short block and with about 100K on it, you might think about going with a long block instead and get the new (rebuilt heads) and valve train as well.  SignatureIf at first you don't succeed, you're not cut out for skydiving So how much would a long block cost ? >>The 5.9L motor in my 98 2500 quad cab has developed a lower end knock. >>It's most noticeable on start for a few seconds but it's always there [quoted text clipped - 21 lines] > going with a long block instead and get the new (rebuilt heads) and valve > train as well. > So how much would a long block cost ? dont quote me on it because its been a few years but seems to me the last time i priced a long block for a customer it was around 1300 to 1500 for a jasper long block with completion kit. like i say ive been out of the business for a while and not sure how well you could trust my memory. but the thing i used to like about jasper for my customers was i could get them a long block resonably priced with completion kit (plugs, wires, cap, rotor, thermostat, hoses, waterpump, belt ect. pritty much everything needed for a complete install) with a 3year 75,000 mile warr through jasper. ofcourse you would have to check with jasper on the specifics on warr and price, but i had good success with them. their website is www.jasperengines.com and thier phone number is (800) 827-7455. hope this is some help. chris > >>The 5.9L motor in my 98 2500 quad cab has developed a lower end knock. > >>It's most noticeable on start for a few seconds but it's always there [quoted text clipped - 21 lines] > > going with a long block instead and get the new (rebuilt heads) and valve > > train as well. > The change in sound you are describing sounds like a main bearing. Hardly. Mains make very little noise when failed. In fact, an engine with a failed main could run for quite some time, depending on how much oil pressure is lost due to the failure. Particularly in the 360, where the mains are 2.800" diameter, the crank is stiff enough to keep any flex to a minimum. Fact is, it could be any bearing on the crank, but is much more likely to be the rods than the mains. >The > problem is that if a bearing has failed, the chances are pretty good that [quoted text clipped - 9 lines] > going with a long block instead and get the new (rebuilt heads) and valve > train as well. Otherwise, seems like you are hitting the mark. SignatureMax Give a man a match, and he is warm for a short while. Light him on fire, and he is warm for the rest of his life. >> The 5.9L motor in my 98 2500 quad cab has developed a lower end knock. >> It's most noticeable on start for a few seconds but it's always there [quoted text clipped - 23 lines] > going with a long block instead and get the new (rebuilt heads) and valve > train as well. >> The change in sound you are describing sounds like a main bearing. > [quoted text clipped - 10 lines] >to be >the rods than the mains. I agree that mains rarely make noise themselves and "might" cause a little vibration rumble in the engine if the get real loose along with bad oil pressure. But indirectly they do cause noise form other sources because when main gets worn, they can cause rods to go because of lack of oil pressure to rods so in a way worn mains do cause noise. > Are there any reasons to not putting rod and/or main bearings in? Or > is a short block the only way to go? Assume this is the gas V8? If you have a knocking from the engine, it could be a rod, but also could be wristpin related, or piston slap. You'll need to diagnose the actual problem first. However, if its rod bearing related, simply putting in another set of bearings isn't the best idea until checking to see: 1) what caused the problem, (lack of oiling due to clogged passageway?) 2) if the crank journal meets acceptable specs (isn't out of round or worn down) 3) that the rod meets specs (isn't out of round, bolts intact) 4) no other problems due to metal floating in the oil. 5) oil pump is performing to spec Given the possibilities, it may be quicker and easier (once a definite diagnosis is made) to go with a short block. SignatureMax Give a man a match, and he is warm for a short while. Light him on fire, and he is warm for the rest of his life. > The 5.9L motor in my 98 2500 quad cab has developed a lower end knock. > It's most noticeable on start for a few seconds but it's always there [quoted text clipped - 9 lines] > > Thanks for any suggestions. Thanks for all the suggestions. Now any recommendations on where to look for a good quality short/long block? Or companies to stay away from? Thanks again. >The 5.9L motor in my 98 2500 quad cab has developed a lower end knock. >It's most noticeable on start for a few seconds but it's always there [quoted text clipped - 9 lines] > >Thanks for any suggestions. Thanks for all the suggestions. Now any recommendations on where to look for a good quality short/long block? Or companies to stay away from? Thanks again. >The 5.9L motor in my 98 2500 quad cab has developed a lower end knock. >It's most noticeable on start for a few seconds but it's always there [quoted text clipped - 9 lines] > >Thanks for any suggestions. |
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