Oil cooler lines

W

wardhillarch

New member
May 23, 2019
59
0
0
Ive been having a slight oil leak under my coach . I got under there and everything had a light coating of oil . Cleaned everything off trying to
find the source. I suspect the flexible section of the oil cooler lines so i want to replace them. What are the size and type of the fittings at the
radiator and where they meet the hard lines? Any other recommendations would be very helpful
Thanks,
Jeff
--
Jeffrey Fleming
1976 edgemonte
Living in Maine
 
> Ive been having a slight oil leak under my coach . I got under there and everything had a light coating of oil . Cleaned everything off trying
> to find the source. I suspect the flexible section of the oil cooler lines so i want to replace them. What are the size and type of the fittings at
> the radiator and where they meet the hard lines? Any other recommendations would be very helpful
> Thanks,
> Jeff

Jeff,

Oil leaks can be a bear to track down. And yes, oil ends up everywhere.
Before you do anything rash, get a can of brake parts cleaner and another can of spray powder - either foot spray or deodorant. The fittings often
leak and can stopped by just making up a little harder. If the line is leaking, there is nothing to do but replace it. If it is an OE line, the end
fittings are reusable. If you can find a shop in Portland that does hydraulics, they can take those lines and "re-hose" them.

I happen to like the JR lines a lot and so have them now. With the cost of the rebuilt engine, that was just noise.

Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit
 
I had the same leak for thousands of miles before I could track it down.
Got single piece replacement lines from JimK and the problem seems to be solved!

The 403 had single piece lines and the 455 has 2 piece for some reason. I prefer the single piece as it's one less place to leak! To put the single on
the 455 you just need a couple of angled adapters coming out of the filter housing.

--
Justin Brady
http://www.thegmcrv.com/
1976 Palm Beach 455
 
You must replace that hose as several have lost their engine when the line
gave away. Yes we stock JRSlaton products and All others.
Those oil lines get hot and after 40 years they give out.
Visit our new web site: www.gmcrvparts.com.
We assist Everyone with tech questions. 800-752-7502

On Fri, Jun 28, 2019 at 5:33 AM Justin Brady via Gmclist <

> I had the same leak for thousands of miles before I could track it down.
> Got single piece replacement lines from JimK and the problem seems to be
> solved!
>
> The 403 had single piece lines and the 455 has 2 piece for some reason. I
> prefer the single piece as it's one less place to leak! To put the single on
> the 455 you just need a couple of angled adapters coming out of the filter
> housing.
>
> --
> Justin Brady
> http://www.thegmcrv.com/
> 1976 Palm Beach 455
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
 
gmcrvparts.com

> You must replace that hose as several have lost their engine when the line
> gave away. Yes we stock JRSlaton products and All others.
> Those oil lines get hot and after 40 years they give out.
> Visit our new web site: www.gmcrvparts.com.
> We assist Everyone with tech questions. 800-752-7502
>
> On Fri, Jun 28, 2019 at 5:33 AM Justin Brady via Gmclist <

>
>> I had the same leak for thousands of miles before I could track it down.
>> Got single piece replacement lines from JimK and the problem seems to be
>> solved!
>>
>> The 403 had single piece lines and the 455 has 2 piece for some reason. I
>> prefer the single piece as it's one less place to leak! To put the single on
>> the 455 you just need a couple of angled adapters coming out of the
>> filter housing.
>>
>> --
>> Justin Brady
>> http://www.thegmcrv.com/
>> 1976 Palm Beach 455
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk
> http://www.appliedgmc.com
> 1-800-752-7502
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
 
The reason the 455 has two pieces is because part of it passes very close to the exhaust manifold and will burn through. GM’d two part line consisted of a steel line and a flexible line from that to the radiator oil cooler. A few years back the steel portion of mine rusted through and I replaced it with JR’s stainless solid tube with a stainless braided attached flexible hose. It has worked well for many years now.

Emery Stora
77 Kingsley
Frederick CO

>
> I had the same leak for thousands of miles before I could track it down.
> Got single piece replacement lines from JimK and the problem seems to be solved!
>
> The 403 had single piece lines and the 455 has 2 piece for some reason. I prefer the single piece as it's one less place to leak! To put the single on
> the 455 you just need a couple of angled adapters coming out of the filter housing.
>
> --
> Justin Brady
> http://www.thegmcrv.com/
> 1976 Palm Beach 455
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
Looks like those nuts at the end of the hoses are 20mm can't seem to find a flare wrench that size😒
Why is everything so hard?
Jezzz
--
Jeffrey Fleming
1976 edgemonte
Living in Maine
 
When I did mine last fall - I needed to buy a 3/4"x7/8" flare wrench. I
seem to recall it was the 7/8" that I used/needed (but it was over six
months ago!)...

Rob
Victoria, BC
76 Royale - Rear Twins/Dry Bath

On Fri, Jun 28, 2019 at 10:10 AM Jeffrey Fleming via Gmclist <

> Looks like those nuts at the end of the hoses are 20mm can't seem to find
> a flare wrench that size😒
> Why is everything so hard?
> Jezzz
> --
> Jeffrey Fleming
> 1976 edgemonte
> Living in Maine
>
 
There are NO metrics used on the GMC MH unless so one did it.

On Fri, Jun 28, 2019 at 10:19 AM GMC Motorhome via Gmclist <

> When I did mine last fall - I needed to buy a 3/4"x7/8" flare wrench. I
> seem to recall it was the 7/8" that I used/needed (but it was over six
> months ago!)...
>
> Rob
> Victoria, BC
> 76 Royale - Rear Twins/Dry Bath
>
>
> On Fri, Jun 28, 2019 at 10:10 AM Jeffrey Fleming via Gmclist <

>
> > Looks like those nuts at the end of the hoses are 20mm can't seem to find
> > a flare wrench that size😒
> > Why is everything so hard?
> > Jezzz
> > --
> > Jeffrey Fleming
> > 1976 edgemonte
> > Living in Maine
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
 
So all is back together and working well
Remove everything from radiator back to adapter seemed like the fitting on the hoses were really really lose, hoses looked brand new. Put in new
gasket at adapter changed oil filter and re torqued all fittings running dry now. Wrestled with replacing hoses while they were out but couldn't wait
with the forth coming up plus hoses did look great after I degooked them . Things are shaping up
Happy motoring everyone and thanks
--
Jeffrey Fleming
1976 edgemonte
Living in Maine
 
You must log in or register to reply here.
Get your shine on at www.cruzingear.co
GMCMI Spring 2026 Rally

Share this page

Share this page
Top Bottom
Back