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Discussion Starter · #21 ·
I looked into the fluidampr, (probably read about it on this page) but I decided against it because of cost, and I’m running one off a 24v. So far I’m happy with the vibrations. If it starts rattling things apart I will re-evaluate!
 

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The regular 24 valve dampener has little to no effect on vibration on a 4bt. It won't hurt but it lacks the weight of the fluid type. The 4bt does not have harmonics like the 6bt. The 4bt dampener adds mass to the crankshaft to help control the vibration. The factory Cummins unit with the adapter weighs around 26 lbs. Yes, cost is usually the determining factor as to whether you use a dampener on a 4bt. The stock 4bt unit which is basically a marine item was around $600 with the adapter and bolts. The same kit from Fluidampr is $700. Not a cheap option.
 

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Discussion Starter · #24 ·
Well I guess I spoke too soon. Took it out for a drive today, got it good and warm, had the same low pressure even with the higher idle. I changed the oil and filter with rotella 15-40 and had no change. I’m thinking I’ll go ahead and change the pump and work back from there.
 

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Discussion Starter · #25 ·
Any thoughts about going with a high volume pump? Diesel tuff has 5346430 for sale listed as a high flow for the 4bt. I am running a HX30W which may be taking some extra oil
 

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Any thoughts about going with a high volume pump? Diesel tuff has 5346430 for sale listed as a high flow for the 4bt. I am running a HX30W which may be taking some extra oil
I'd say it depends on useage.. I have a 6bt with 350,000 miles.. and it idles at about 15 fully warmed.. 65-70 cold... buyt notw powered up.. factory oil pump is fine unless you are doing high rpm /high power I don't see the point... but if you are going to replace the oil pump... Id suggest changing the cam bearing at the same time.. you'll be there anyways..
 
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