Ford 1700 Crankshaft pulley fell off. Please help!

msg1956 · May 14, 2020

Hi All!

I was running my 1983 Ford 1700 the other day, when I heard a crashing noise. I shut the tractor off immediately, and discovered the Crankshaft pulley had lost it's retaining bolt, and fallen off. Since the fan belt tension kept the pulley in place, and I have no reason to inspect/maintain this portion of the tractor, who knows how long ago this bolt shook lose.

Anyway, I saw that the pulley is weighted and balanced, so I figured it must need to be oriented a certain way on the crankshaft. However, my factory service manual (which covers 1300-1900 tractors) only covers disassembly, and illustrates a keyed crankshaft, with a threaded end for a nut. My tractor has a finely splined crank, with a threaded hole in the middle for a retaining bolt. I haven't a clue how to orient the pulley back on the crank. I notice two of what look like timing marks on the OD of the pulley, and a pointer bolted onto the front of the block, but since the engine ran for a few seconds after the pulley fell off, I don't know which way is "UP".

I can muddle my way around a gasoline engine, but need a little help with an almost 40 year old Japanese diesel! Can someone please point me in the right direction?

Thanks!

radios1 · May 14, 2020

don't you just hate when that happens?. anyway, look here. https://www.tractorbynet.com/forums/parts-repairs/413928-ford-1700-crankshaft-pulley-position.html

JC-jetro · May 15, 2020

msg1956 said:
Hi All!

I was running my 1983 Ford 1700 the other day, when I heard a crashing noise. I shut the tractor off immediately, and discovered the Crankshaft pulley had lost it's retaining bolt, and fallen off. Since the fan belt tension kept the pulley in place, and I have no reason to inspect/maintain this portion of the tractor, who knows how long ago this bolt shook lose.

Anyway, I saw that the pulley is weighted and balanced, so I figured it must need to be oriented a certain way on the crankshaft. However, my factory service manual (which covers 1300-1900 tractors) only covers disassembly, and illustrates a keyed crankshaft, with a threaded end for a nut. My tractor has a finely splined crank, with a threaded hole in the middle for a retaining bolt. I haven't a clue how to orient the pulley back on the crank. I notice two of what look like timing marks on the OD of the pulley, and a pointer bolted onto the front of the block, but since the engine ran for a few seconds after the pulley fell off, I don't know which way is "UP".

I can muddle my way around a gasoline engine, but need a little help with an almost 40 year old Japanese diesel! Can someone please point me in the right direction?

Thanks!

The marking on the pulley is for fuel injector timing. You do not have ignition timing as you have a diesel and everything is timed internally inside of timing over and they are meshed gears and can't jump. I have not taken mine off to see if it is keyed. if it is then just put it back and you will be okay. if it is keyed at most it will be 180 degrees out visually but injector timing would stay where it was. Please look at the attachments

Dataway · May 20, 2020

Does it have a skip spline? A spline where one tooth is skipped so it will only go on in the same position?

JC-jetro · May 20, 2020

Dataway said:
Does it have a skip spline? A spline where one tooth is skipped so it will only go on in the same position?

Can you take a pic and post. if you have a keyway, then the splines will line up whee they were. Your injection pump timing is not changed. Let's say your belt slips... then does it change your timing ? No, it does not. if you put the pulley back and splines are off, your injection timing is still the same but the problem is if you remove the injection pump then it would be difficult to re-time the injector as previous index is not there anymore. Like I said, I have not removed my crankshaft pulley ever as I never needed to do so, but if indeed you have a keyway then pulley goes exactly where it was before.

Did you put the pulley back? Does the tractor start?

JC-jetro · May 20, 2020

Look at the attached PDF. Look at Part#3. There is a key there. Can't tell for sure if it will be for crankshaft pulley or not for 100%, but I bet ya a buck it is. You can only put the crank shaft where it was before if you use the key. Just for good measure I will get my dremmel tool and put a witness mark at the end of the shaft and pulley for future reference.

msg1956 · May 20, 2020

Guys

Thanks for the replies.

Radios1

Thank you for the link to the manual. It was just the information I needed. Both the end of the spline, and the inside step of the pulley had a good coat of rust/grease/dirt, so I did not notice the alignment punch marks until I cleaned everything up. It is all back together now. Thanks again.

Dataway

The end of the crankshaft is just a fine, un-interrupted spline. You can put the pulley back anyway in a 360 degree arc. That is why I was concerned, since it is weighted, and I knew it need to balance out with the crank. There are just two rather small punch marks the link things up, but its all good now. Thanks!

JC-Jetro

I was pretty sure that the pulley would have no actual effect on the tractor running (other then the weighted pulley fighting the rotation of the crank). I also figured that the timing marks and pointer were probably for the injection pump. It was just that I could see the pulley was weighted, and it had timing marks on it, so it had to go back in the proper orientation to make these two features perform correctly. Until I uncovered the punch marks on the end of the crank and the inner step of the pulley, I had no idea what the orientation was.

If you look at the pictures you posted, you can just make out the head of the bolt that I lost in the middle of the pulley. The factory service manual I have illustrates that the end of the crank is keyed, and threaded for a nut. My crank (and I believe yours) has a splined end, with a bolt and washer to hold the pulley on. The parts breakdown you posted has a key, but I believe it is for the gear (#2), not for the pulley. But I do appreciate all the time and effort you took to reply.

Once again everyone, thanks! I had the information I needed within 45 minutes of my original post. When it comes to these old tractors, it is only the collective knowledge of owners/enthusiasts that can answer a lot of these less straight-forward questions (especially when the factory service manuals are just wrong!).