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AQ125A flywheel housing screw

A

Algirdas Matusevicius

New member
Hi,
I was wondering, could anyone explain what's the purpose of this highlighted screw/bolt? The engine is VolvoPenta AQ125A.
I had a problem in the summertime, this srew loosened up eventually falling down and the water started to splashing through the hole. Once I put the screw back and tightened up the screw, water stopped from leaking. Could anyone tell me where did the water come from to that area under the flywheel housing? Or perhaps that's what's supposed to be?
wlywheel housing screw.jpg
 
Algirdas Matusevicius said:
................ eventually falling down and the water started to splashing through the hole. Once I put the screw back and tightened up the screw, water stopped from leaking. View attachment 1647
Click to expand...
This red part is your Flywheel Cover.... (aka Bell Housing in the auto world).
It would be considered a "dry" area in front of it and behind the engine.... no water at all here.
I have four of these here.... none of which use this size thread in this location! Perhaps someone has drilled this out!


Now.... could you be mistaken? Could the fitting that is leaking water, be SEQ # 66 here? (see below)
If so, then you have a drive shaft bellows that has failed, the PDS cavity has filled with water, and this grease port is subject to this same water.

If so, please post back. You already have damage that you are not yet aware of.
5264_big.png
 
Maybe someone has drilled this out before, but I didn't.
Ok, I will inspect closer this drive shaft bellow, but as I looked before it was ok, not new but ok. Or maybe there are other causes where water come to this area in
 
What I find odd, is that you suggested that this water was coming from this bolt when removed! I know that this bolt could NOT be a source of water, and is what caused me to ask about being confused between the bolt and the actual grease port fitting "cover" (if old style cap affair).
The grease port fitting would be a lilkely candidate if the following were to occur;

I will tell you with a fair amount of confidence, there is ONLY ONE path that water could follow, in order to enter the inside area of this flwheel cover....., and that would be through the PDS bore! (primary drive shaft and bearing bore in the F/C)
Furthermore, the front seal would need to have breached....., or in this "long-shot" scenario, the grease port cap would need to be open!

In either event, it would require a breach, of some sort, at the aft-most bellows "snout" area!
Whether bad bellows, a crack, or severe corrosion...... something would need to allow water to enter from AFT of the transom shield/flywheel cover connection.

I would suggest lifting the helmet up, loosening the aft-most bellows clamp, and looking inside.
If this area is wet, the transmission will need to be removed for new bellows, PDS bearings, main drive gear seal..... and possibly bearing cross replacement.
Again.... if wet, I can't stress enough of the importance of this!

Otherwise, this is somewhat of a mistery to me!

Perhaps Eduardo will have a comment or two.

.
 
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