MEP-803A flywheel issue

[BrnH2ORat]

It's a Perkins 1104C-E44T, not the lister from the 803, it's out of my TREX PT-100 skid steer.

 

[BrnH2ORat]

I've seen all the bolts shear before, but more commonly the drive plate is what gives up the ghost. You might want to have it magnafluxed to confirm no hairline cracks before reassembly.

My guess is the bolts never were torqued correctly, it only has a few hours on it after coming out of depot for the tier II upgrade, Yep, magnafluxing both the drive plate hub and flywheel and crankshaft end is probably a good idea, I'll throw them on the bench in the morning and sprinkle some magic dust on them and hopefully wont find any cracks !

 

[BrnH2ORat]

None of them have the dowel pin hole.

As far as I remember, 10.9 was what its supposed to be.

I think Monday I'm going to contact Lister and or Onan and see why they don't use a dowel pin in the flywheel ? It wouldn't be to hard to put the flywheel on my milling machine and drill out a dowel hole BUT there is a reason MAYBE that this isn't done at the factory. might be a designed weak link to protect the crankshaft.
I'm also questioning if these are the correct bolts being used. They look like home depot off the shelf cheap Chinese bolts, not something that meets MILSPEC, I did find the NSN for these, 5305-01-368-7450 but haven't found the MILSPEC info for the bolt.

 

[BrnH2ORat]

Perkins aint even close to this engine.

The Perkins is from a different project, TREX skid steer.

 

[Light in the Dark]

I've got a handful of parts engines here if you need bolts, FYI.

 

[Ray70]

Well I guess I'll know in a few days! I'm in the middle of doing the machine work on a Perkins 1104C, making 1 good engine from 3 bad ones. I'll have to figure out if this DN4M has stock crank journals, don't want to replace rods if I don't have to.

I see here where we went off track on the rods... It really sounded like you were not looking forward to changing rods on the DN4M in your 803, not the 1104C Perkins.... guess that post got a little mixed up!

 

[BrnH2ORat]

I wasn't looking forward to changing rods in either! I didn't want to have to pull out and taredown the 803, I've already got 3, 1104's tore down and piles of parts all over.

I did find out the 803 has had the rods and crank and bore machined, 10 thousands under on crank & rods, 10 over on the bore.

 

[BrnH2ORat]

I've got a handful of parts engines here if you need bolts, FYI.

Would you be able to post a picture of the bolts? and a length measurement? I have a really good industrial hardware supplier near me who stocks a lot of good quality metric hardware, I searched all over for the MILSPEC for them, it would give all the dimensions but had no luck on that.