Oil leak on B48

4510 Views 14 Replies 7 Participants Last post by eBoyDog, Apr 12, 2011

eBoyDog

Discussion Starter · Apr 8, 2011

I have an oil leak on the filter adapter on a B48, can I get just the one gasket or do I have to by some kit? Is the gasket available at Cummins dealers?

As the orginal gasket is intact, what would be wrong with using high temp RTV gasket sealer or a no expense temp repair esp to make sure the engine runs.

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gator_rider2

· #2 · Apr 8, 2011

As long time user of RTV I take all old gasket off just use RTV.
Clean surfaces of oil and dry take RTV on end finger thinly apply to one surfaces thin as onion skin. Wipe any mash out off try to not have but very little mash out. The only time I use RTV with gasket when gasket used as shim. RTV is more permanent than gasket gaskets shrink over time.

CASE 220/4

· #3 · Apr 8, 2011

gator_rider2 said:
As long time user of RTV I take all old gasket off just use RTV.
Clean surfaces of oil and dry take RTV on end finger thinly apply to one surfaces thin as onion skin. Wipe any mash out off try to not have but very little mash out. The only time I use RTV with gasket when gasket used as shim. RTV is more permanent than gasket gaskets shrink over time.

:headscratcher: :headscratcher:

Hydriv

· #4 · Apr 8, 2011

CASE 220/4 said:
gator_rider2":1bqnwahl]As long time user of RTV I take all old gasket off just use RTV. Clean surfaces of oil and dry take RTV on end finger thinly apply to one surfaces thin as onion skin. Wipe any mash out off try to not have but very little mash out. The only time I use RTV with gasket when gasket used as shim. RTV is more permanent than gasket gaskets shrink over time.[/quote] :headscratcher: :headscratcher:[/quote:1bqnwahl] INTERPRETATION As a long-time user of RTV ([URL="http://tinyurl.com/23hvnjr said:

http://tinyurl.com/23hvnjr[/URL] ), I just remove all of the old gasket material from the mating surfaces and use RTV in the place of a new gasket. I make sure that the surfaces are totally clean of any oil residue (Brake Cleaner) and that they are dry. i then apply a thin layer of RTV with my finger to one surface only. The RTV does not need to be thicker than that of an onion skin because any excess will squeeze out when you tighten the bolts. That could put the excess RTV into places that you don't want it to be and cause problems for you. However, there are some places where the gasket is absolutely needed because it acts as a spacer as well as a gasket and a thin layer of RTV won't duplicate the spacer aspect of the gasket. Over time, some gaskets do shrink due to the heat from the engine and they can fail (leak) as a result. Many of the auto manufacturers have gone to RTV for certain areas of their engines.

Click to expand...

Kenc

· #5 · Apr 8, 2011

In applications where a thicker gasket is needed, such as stamped steel parts matting to machined surfaces: I apply a thicker coat but let it partially cure before mating the parts. The skin that is formed over the RTV will prevent much of the squeeze-out.

One other suggestion: I keep a box of cheap rubber gloves in the shop and slip one on to spread the RTV. Makes it easier to get a nice even spread without having to wash that stuff off my skin.

boomers_influence

· #6 · Apr 9, 2011

club
i NEVER USE RTV on any gasket on my onan engines.
the reason being the the EXCESS ends up in the oil pick up tube screen.

as to the filter adapter, remove it and carefully surface plane it on a flat surface
with some sandpaper.(about 120/ 150 grit.)
use a new gasket, (it is ava. separately )
if you want to use some sealer,use permatex form a gasket #2.
spread it as thin as you poss. can.
thank you. boomer

eBoyDog

Discussion Starter · #7 · Apr 10, 2011

Help BOOMER!

Ok, got the engine fired up and it's still leaking oil.

The leak isn't coming from the filter adapter were it bolts onto the block but rather the were the filter screws on.

Could it have the wrong filter? the filter on it when I got was a WIX 51374 and I had onhand a WIX 51348 which is for a Kohler Magnum but both leak in a steady stream once the engine is started (which I promtly shut off).

I took the filter adapter off and cleaned to see if it was cracked, I suspect the problem is a simple as the wrong filter?

Hydriv

· #8 · Apr 10, 2011

viewtopic.php?f=8&t=521&hilit=onan+filter

eBoyDog

Discussion Starter · #9 · Apr 10, 2011

That's easy then, wrong filter.

This is the engine running, I uploaded a to You tube a video of it to get thoughts on the noise it's making, I don't think it's healthy. Esp watch the end and you can see the leak and the dieseling noise when I shut it off.

Hydriv

· #10 · Apr 10, 2011

You cannot assess an engine unless you first service it fully.

- set the valves

- set the timing after cleaning and gapping the plugs and points.

- decarbonizing it should also be done.

You have to eliminate things that could cause detonation and other phantom noises that might sound like bad trouble but are simply neglect by past owners.

boomers_influence

· #11 · Apr 10, 2011

eboy
the 1374 should be the correct filter.
i would look closely at the surface that the filter seals against.
some have grooves, and some are flat. (they both have the same casting #)
boomer

eBoyDog

Discussion Starter · #12 · Apr 10, 2011

Mine has grooves, when I had it off I didn't notice anything unusual but I was looking at the other end more than the filter side.

:headscratcher:

I will check it again and see if I can figure something out, it not a drip leak, it's a steady stream and I would guess that running the engine longer than 30 minute would empty it.

robynrj

· #13 · Apr 11, 2011

I think bolts have brass washers on them to seal. Bob M

eBoyDog

Discussion Starter · #14 · Apr 11, 2011

robynrj said:
I think bolts have brass washers on them to seal. Bob M

I noticed that too on mine but that's not were the leak is, it's leaking from were the filter screws on and makes contact. Very weird.

Didn't work on it this afternoon, made a trip over to St. Lous and picked up some used tims with tire that I'm going to get new AG's mounted on also picked up part of a sleeve hitch cheap.

eBoyDog

Discussion Starter · #15 · Apr 12, 2011

Ok, any ideas what might be wrong to make an oil filter leak in a steady stream were the rubber on the filter base makes contact with the filter base?

This base has ridges, I got another filter and it does the same.

Could the base were the filter screws on be cracked? if it is I can't see it.

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