Leaking front cap on MC8

[lv2rescue]

Hi, I have been trying to locate a leak or leaks that come in and down my windshield on my MC8. I have replaced the window rubber and the clearance lamps on this coach and still have a leak, mostly while the coach is moving. I am trying to find out if anyone has had a problem with either the rivets that attach the roof cap to the metal roof leaking or water coming in the gap between the cap and the roof. If so, what is the best material to seal it with?
Thanks for any help
Chris

[H3Jim]

I have had great luck sealing exterior roof items with Dichor.  Its made to seal a rubber roof, but once you put it on, it wont ever leak in that spot again.  A long time installer of solar panels on RVs of all types uses Dichor and has never had a leak since he switched from using silicone.

Others have painted their roof with Cool Seal and had good results.  other than some complaints about staining and discoloring, it will seal a leak roof very well.

I'm not sure what to to tell you if its leaking around the windshield, other than  persistance.  Perhaps a way is  to put a fan in a window and seal around it so it creates a positive pressure inside.  Then walk / climb around the outside with a lit cigarette and see where the smoke blows.  A lot of work though.

[Hi yo silver]

How about pressurizing with a fan in the only opening, then soaping the suspect seams and joints and looking for bubbles.  Works for some.  Let us know what works for you.
Dennis

[edroelle]

I had a similar problem.  The cause may be different in your case though.  Water was pushed around the windshield seal.  Anywhere there was any gap between the rubber and glass, I applied black, roofing, polyurethane.  To ease clean-up and appearance, I put masking tape on the glass and seal.  I also smoothed the joint with a wetted finger of paint thinner.

This helped considerably, but not 100%.  Water may have been pushed up and under the cap.

Ed Roelle
Flint, MI

[Sojourner]

About pressurizing the room or coach to find leaks around it. Get a squirrel cage blower from old furnace to fasten over a window's opening or door opening with a thin sheet of plywood as a filler. All other window & vents are close. Your will be amaze where all the leaks are...using liquid dish soap & water & car-wash brush to apply. It WORK EVERY TIME.

I use it for many customer's car body & window & door leak.
Squirrel cage blower has enough pressure & cfm to give you the result to find what leaking. It simple & fun.

FWIW

Sojourn for Christ, Jerry

[DavidInWilmNC]

Chris,

I had the same leaks on my 8.  I also sealed around the windshield and replaced the clearance lights.  Make sure you seal both sections of the windshield gasket - glass to gasket and frame to gasket.  I thought I had all the leaks stopped when I found a couple drops on the last trip.  It was raining so hard that cars were pulling off the interstate and buses and trucks were pretty much the only vehicles still driving.  When I got home, I found that I hadn't sealed one of the clearance lights to the bus.  I used a very small bead of clear silicone sealer between the rubber seal on the lights and the cap on the bus on all the other clearance lights.  I'm not sure that this is always necessary, but it stopped the leaks in the front and the side clearance lights on my bus.  Also, sometimes the lenses don't seal well to the rubber and water will get forced past the lens and into the socket and drip out the back.  On those lights, I sealed the lenses to the rubber bases (they're not difficult to remove even with sealer).  Good luck.

David