Right bank issue

dtcerrato · November 04, 2016, 06:48:30 AM

Got the cylinder head back from the machine shop, all the valves were replaced in the bad cylinder, the rest of the head checked out ok, the seats were checked out & reworked where needed. No surfacing needed - it is flat. The head cylinder that was banged up a bit from ring fragment was touched up. Left the rods with them for checking for straight and magnafluxing, will go from there. Ran the caliper on the block bores and rod journals, everything is checking out. All the crank & rod journals are .010" oversize and looking ok, the block bores are looking ok for #2 standard liners. Will probably stay with trunk pistons. Never did find anymore model/serial #s on the block. Got the entire oil bath air cleaner system restored, pushing on...
Brian, thanks for the words of encouragement...

luvrbus · November 04, 2016, 06:54:38 AM

Now is a good time to change the filtration system over to paper,oil bath systems are not that good on the old buses

dtcerrato · November 04, 2016, 07:09:07 AM

I hear what your saying & there may be good reason for it, if there is I'd like to see it. My personal testimony to oil bath: when we purchased the coach in 1979, the oil baths looked ok - but a buried unseen gasket deeper into the cowling of the system was breeched in shambles allowing dirt to enter the system. That was one of the first items we restored. Since than (36 years ago) that restored system has been running really clean, we're talking downstream from the oil bath filters...the airways leading to the blower are as clean as the day we restored the system - so please elaborate on what it is about the oil bath cleaners that us users of should be concerned about. Thanks

luvrbus · November 04, 2016, 07:28:41 AM

Paper filters are 99.8 to 99.9% efficient at all speeds the chart shows a straight line at all speeds and only pass .2 of dirt, the oil baths are 96. to 98.7 efficient and are on a curve at different speeds passing 1.3 of dirt.

That info is not from me or a filter manufacture but from the DD engineering bulletin #39.

When DaveC shows up next week I will get him to post the bulletin so all can read it,I have no luck scanning and posting here, it is a interesting read for sure that people should know

DoubleEagle · November 04, 2016, 07:56:57 AM

Quote from: luvrbus on November 04, 2016, 07:28:41 AM
Paper filters are 99.8 to 99.9% efficient at all speeds the chart shows a straight line at all speeds and only pass .2 of dirt, the oil baths are 96. to 98.7 efficient and are on a curve at different speeds passing 1.3 of dirt.

That info is not from me or a filter manufacture but from the DD engineering bulletin #39.

When DaveC shows up next week I will get him to post the bulletin so all can read it,I have no luck scanning and posting here, it is a interesting read for sure that people should know

That is interesting, the oil bath type did better than I would have guessed, but paper is more effective. Oil baths are cheaper to run if you service them yourself, and stay off dirt roads.

eagle19952 · November 04, 2016, 03:20:45 PM

we used to swab the intake piping with 90 weight. it would tattle any dusting sized particles that were induced via poor filtration or loose clamps...

dtcerrato · November 04, 2016, 06:11:03 PM

I'm OK with 98.7%. That is a good number. Paper is a little better but not better enough to change over.
Don't need to oil swab anything into the air intake as much as it needs to be swabbed out!
Looking forward to see the bulletin, especially the date on it... Thanks

dtcerrato · November 04, 2016, 06:12:40 PM

Forgot to mention, can't stay off the dirt roads cause they lead to the best places!

luvrbus · November 04, 2016, 07:09:20 PM

The 98.7 is at full throttle it is the dirt passed that is the killer 1.3 vs .2 ,you can probably down load the bulletin on the net the info is Table 4 page 9. Mine is revision No. In 2 only the exhaust restrictions charts changed LOL surely I am not the only one here with the bulletin

eagle19952 · November 04, 2016, 07:49:43 PM

Quote from: dtcerrato on November 04, 2016, 06:11:03 PM

Don't need to oil swab anything into the air intake as much as it needs to be swabbed out!

your motor your money your way...makes sense to me

Oonrahnjay · November 04, 2016, 08:13:47 PM

Quote from: luvrbus on November 04, 2016, 07:09:20 PMThe 98.7 is at full throttle it is the dirt passed that is the killer 1.3 vs .2 ,y...

The best air filter is only just good enough for me.

Nel · November 05, 2016, 05:11:34 AM

Dan , sounds like the oil bath did the job all these years so why mess with it. I have a 4104, sorry to hear yours needs some loving now but I like the way you are tackling the issues,following your posts and reading how long you have had your 4104, gives us 4104 owners a lot of faith in these old machines, glad your going to keep her a live. We give our 4104 a lot of love too and really enjoy it, it's a great machine, keep up the good work! Nelson

dtcerrato · November 05, 2016, 06:08:53 AM

Thank-you Nelson. With the help of these bus forums it's hard not to keep the vintage buses alive. Ironically even having been married to our 4104 for almost 4 decades, we have just got on board with this & other bus forums less than a year ago, including the first rally we ever attended last year. Never really visioned getting DEEP into drive line components. With the backup of the cumulative experience of the people on these forums, and the commorodity & willingness to share what we all know gives us all the ability to upkeep & maintain our busses. Now that we're into the guts of such an awesome machine is really no different in all the admiration we've had on every component we've laid our hands on. My hat comes off to the manufacturing & engineering sector of our private enterprise to join in with the federal government in time of world war to put such stout manufacturing into motion for military success and eventually civilian public service proliferation. Don't mean to go off, just really appreciate your kind words & the machines we own...

DoubleEagle · November 05, 2016, 06:23:35 AM

The 4104 and the 2 cycle Detroit, and all the trucks and airplanes of that era, were created without the help of computers. It seems that the 4104 is one of the best surviving buses of all time.

luvrbus · November 05, 2016, 07:40:52 AM

I was only making a suggestion I don't really care which filter system you use.DD upgraded that engine for 40 years squeezing more life out of it and they were successful they made a 2500 hr engine last up to 5000 hrs
No more miles than people put on the old engines oil bath filters should be ok. Oil bath filters have always had a problem with oil misting all one needs to do is look at the intake piping it will be covered in oil.
Air filtration for engines has changed drastically in the past 40 years