Question on D-17 Engine Wear/Knocking on Startup

loveshisallis · Jan 23, 2017

Hello;

This is a partial repost of an earlier email. I have 1963 Series III D 17 which had two problems, 1. Took 5-8 seconds to develop full oil pressure, then fine. 2. A knock on startup that would last the same 5-8 seconds, then be fine. The final thing I can say is the the previous owner had lent it out to a neighbor once and the tractor come back three quarts low and also he had to install a new head gasket.

Got to working on the mill and here is the information. Check the first 2 mains (from the front) and they plasticgaged out to just over .003. The first rod checked at .0015. I could not quite catch my nail on the surface on the crank.

So one question I have is can that main bearing clearance (Book sez .0035 is upper limit)cause the problems I have listed?

Also opinions on the job invited.

Thank You

ErnieD · Jan 23, 2017

How is the oil pressure cold versus hot? Worn or excessive bearing clearance will have good cold pressure and poor hot. Is the oil filter correct? Sounds like the oil filter is draining back during shut down. Cut the filter apart and look for bearing material and a drain back check flap. Are .001 over bearings available? Whats the bearing shell look like? How many hours? Is the oil pump worn and is a kit available.

DrAllis · Jan 24, 2017

Rotate the crank 180 degrees from the picture and run your finger over the center main journal. They wear on one side.

Allis Dave · Jan 24, 2017

Is the earlier D17 with the old bypass oil filter system or the newer full flow oiling witht he 3/8's lines on the side? There is no possibility of drain back in the old system because the oil always goes straight to the bearings and some "leftover" oil going to the filter.

DrAllis · Jan 24, 2017

It is claimed to be a Series 3....that would be full-flow oiling and they do drain back overnite, so the filter is empty on a morning start-up.

Nordic · Jan 24, 2017

If all rod bearing clearances are 0.0015" that's very good providing the crank journal is perfectly smooth. If that was my engine I would like to have around 0.002" clearance on the main bearings when putting it back together. When you have an engine with "generous" bearing clearances a bearing knock will show up much quicker if the timing is a bit too advanced and sometimes you can virtually avoid bearing knock by retarding the timing a bit below factory setting. Of course with the extent of work you are putting in here you want the engine to be really good when finished.

Question on D-17 Engine Wear/Knocking on Startup

loveshisallis

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ErnieD

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DrAllis

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Allis Dave

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DrAllis

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Nordic

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