Bolt sizes on a Jabsco...

[symondo]

Posted this under motor boat section by accident but can anyone advise on the below?

The information states to use an M8 bolt. however i'm curious to wether some M6 bolts would give sufficient strength if the holes in the jabsco itself were to be packed, and washers were used?

Would an M6 bolt have enough strength to hold the unit in some iffy weather while in use?

 

[jon711]

Which Jabsco???

Jon

 

[symondo]

Which Jabsco???

Jon

Ermmm a full size manual sea toilet, not sure of a model number but can probly find it online if it helps?

 

[jon711]

OK large bowl Manual toilet, used on a motorboat (guessing as orginally posted on Motorboat forum!).

Personally I always like to see the biggest size possible fitted (there can be a lot of wringing on the mounting bolts), that said, I have seen them installed using size 10 self tapers, and seeming secure. With the manual, you have a bit more chance with M6 bolts, than you ever would with the electric units. BIG washers and a strong backing pad should be OK, but I would be tempted if that is your only soloution, to take care when using in a choppy sea! Is the reason to use M6 that you have some lying around, or is it down to installation issues? If it just the case you have some M6 then for the cost of a few pennies then it would be worth buying some M8's.
If you do decide to go for the smaller bolts, do not think that bonding the base to the plinth/boat will make it more secure, it is more likely to have a chemical reaction with the plastic, and weakening it!

Hope that helps

Jon

 

[symondo]

OK large bowl Manual toilet, used on a motorboat (guessing as orginally posted on Motorboat forum!).

Personally I always like to see the biggest size possible fitted (there can be a lot of wringing on the mounting bolts), that said, I have seen them installed using size 10 self tapers, and seeming secure. With the manual, you have a bit more chance with M6 bolts, than you ever would with the electric units. BIG washers and a strong backing pad should be OK, but I would be tempted if that is your only soloution, to take care when using in a choppy sea! Is the reason to use M6 that you have some lying around, or is it down to installation issues? If it just the case you have some M6 then for the cost of a few pennies then it would be worth buying some M8's.
If you do decide to go for the smaller bolts, do not think that bonding the base to the plinth/boat will make it more secure, it is more likely to have a chemical reaction with the plastic, and weakening it!

Hope that helps

Jon

access is a bit of a nightmare to get an M8 bolt onto a thread - i dont really wan to have to cut a panel so i had looked to use some of the expanding bolts which spread out and effectively hold a thread in place within the hole and the way it spreads out i figured it'd work well like a washer to spread the load - however my old man is concerned as the details say M8, that the thinner bolts wouldnt be sufficent enough. yet it seems theres going t obe a lot more work to fit M8 nuts.

 

[Aardee]

While I'm all for using your engineering nous to find an easy solution, you really don't want to risk your khazi coming adrift on a dark & choppy night whilst the missus is "powdering her nose"

 

[symondo]

While I'm all for using your engineering nous to find an easy solution, you really don't want to risk your khazi coming adrift on a dark & choppy night whilst the missus is "powdering her nose"

this is exactly what im looking to avoid lol

 

[jon711]

Another possible soloution, Cut a new plywood plinth the size of your existing plinth, bolt the toilet to that using countersunk M8's. Secure the pywood base with toilet on to the existing plinth and bolt or screw around the edge of the plith with multiple smaller screws/bolts. It should overcome any problems with wringing on the base, and assuming enough screws/bolts are used should be secure.

Jon

 

[West Coast]

If the jabsco is the one with the plastic base, same as mine, I would have thought M6 with larger washers would be fine, suspect you will break the plastic long before you break the bolt

 

[Tranona]

If the jabsco is the one with the plastic base, same as mine, I would have thought M6 with larger washers would be fine, suspect you will break the plastic long before you break the bolt

Agree. It is not the strength of the bolt that is the problem, but the size of the holes which are a snug fit for M8 but an M6 will potentially allow movement. Suggest sleeve the holes and use M6 with big washers.