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 > Resealing DRV A/C Dometic Penguin II Unit On Roof

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Cummins12V98

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Posted: 04/05/20 10:04am Link  |  Quote  |  Print  |  Notify Moderator

I agree people should check tightness of lag bolts. I have owned 2 DRV's over 9 years with zero leaking. I am on DRV Forums with no leaks mentioned.


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dmorse68

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Posted: 04/05/20 11:59am Link  |  Quote  |  Print  |  Notify Moderator

pcm1959 wrote:

Those lag bolts that hold a/c unit on to the roof on many of the new RVs with no visible means of attachment on the inside are a huge source of possible water as they are outside the a/c seal and/or shroud. Be SURE they are properly sealed.
Many a/c units are leaking into the roof on these types of a/c units unknow to the owner since it is not likely to show up on the inside due to the insulation and ceiling panel particularly if a vinyl/padded ceiling.


The only way I discovered I had water intrusion was, I took the bedroom’s fantastic fan inner shroud trim piece off so that I could place a mouse trap up in the insulation cavity, and saw the roof plywood dark and wet.


-David
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pcm1959

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Posted: 04/05/20 06:47pm Link  |  Quote  |  Print  |  Notify Moderator

dmorse68 wrote:

pcm1959 wrote:

Those lag bolts that hold a/c unit on to the roof on many of the new RVs with no visible means of attachment on the inside are a huge source of possible water as they are outside the a/c seal and/or shroud. Be SURE they are properly sealed.
Many a/c units are leaking into the roof on these types of a/c units unknow to the owner since it is not likely to show up on the inside due to the insulation and ceiling panel particularly if a vinyl/padded ceiling.


The only way I discovered I had water intrusion was, I took the bedroom’s fantastic fan inner shroud trim piece off so that I could place a mouse trap up in the insulation cavity, and saw the roof plywood dark and wet.

There ya go! Trust me, there are many, many others with the same situation and don't know it.


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Cummins12V98

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Posted: 04/05/20 07:42pm Link  |  Quote  |  Print  |  Notify Moderator

This is why the lag bolts should be checked.

Retired JSO

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Posted: 04/05/20 08:52pm Link  |  Quote  |  Print  |  Notify Moderator

pcm1959 wrote:

dmorse68 wrote:

pcm1959 wrote:

Those lag bolts that hold a/c unit on to the roof on many of the new RVs with no visible means of attachment on the inside are a huge source of possible water as they are outside the a/c seal and/or shroud. Be SURE they are properly sealed.
Many a/c units are leaking into the roof on these types of a/c units unknow to the owner since it is not likely to show up on the inside due to the insulation and ceiling panel particularly if a vinyl/padded ceiling.


The only way I discovered I had water intrusion was, I took the bedroom’s fantastic fan inner shroud trim piece off so that I could place a mouse trap up in the insulation cavity, and saw the roof plywood dark and wet.

There ya go! Trust me, there are many, many others with the same situation and don't know it.


There are 3 units on my fifth wheel. After a heavy rain,I discovered a small drip of water at the most rear register actually behind where the a/c is mounted. Thought at first it was condensation. After another heavy rain, drip drip. I then torqued all the lag bolts on all 3 to 50” pounds which has stopped any visible leak.





Cummins12V98

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Posted: 04/06/20 11:18am Link  |  Quote  |  Print  |  Notify Moderator

"I then torqued all the lag bolts on all 3 to 50” pounds"

That's an interesting torque. Reality that's slightly above 4'# TQ.

TXiceman

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Posted: 04/06/20 03:26pm Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

"I then torqued all the lag bolts on all 3 to 50” pounds"

That's an interesting torque. Reality that's slightly above 4'# TQ.


You only want to compress the gasket, not crush it.

Ken


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