PDA

View Full Version : Pylon Monunting Bolts


mika
02-28-2005, 01:41 PM
I had a problem last season with my pylon mounting bolts getting loose. Granted I have an extended pylon on at times, that I am sure is the cause. I just wanted to see if anyone know the torque specs for these bolts? I am also curious if other have had this problem also. I have been considering adding some thread locker to help keep things more reliable. I know they should be checked often but just trying to buy some insurance.

Oh yeah I have a 98 Prostar 190.

Tom Wortham
03-01-2005, 11:30 AM
Ensure the nuts that you are using have the nylon inserts on them. This should prevent them from backing off. I have not had a problem with mine. Used a sky high pylon (that slips over the existing pylon)... no problems yet... but ski more than I board. Goodl Luck. :friday:

chico
03-01-2005, 11:39 AM
I Had The Same Problem With Mine.there Is A Steel Plate In The Stringer.
If You Cannot Tighten These Bolts,you Can Drill And Tap New Ones.i Also Installed Two Stainless Plates From The Pylon Mount To The Front Engine Mounts.i Have'nt Had Them Come Loose Again.

mika
03-01-2005, 03:43 PM
I can not remember if they are nylock nuts or not now.

I have a skylon slip on as well. I guess about 50/50 ski and board. I only had to tighten them once last season but I guessed on how tight. Needless to say I wrenched them down to about 150 to 180 ftlbs. I was shocked at how loose the got. Ever since then I have been hyper senstive as to the pylon attachment point and I keep a close eye on the tension cable for the skylon. When I we get some warmer weather I will look at the the nuts and make sure they are nylocks and if not I will add some.

Chico mine has U bolts that wrap around the pylon and the U bolts pass through a SS plate. I am glad to here I am not the only one that has had that problem. It scared me at first since this past season was my first with an extended pylon.

JohnnyB
03-03-2005, 01:20 PM
I Had The Same Problem With Mine.there Is A Steel Plate In The Stringer.
If You Cannot Tighten These Bolts,you Can Drill And Tap New Ones.i Also Installed Two Stainless Plates From The Pylon Mount To The Front Engine Mounts.i Have'nt Had Them Come Loose Again.


Can you post some pics of this setup??!!!!

chico
03-04-2005, 10:31 AM
johnnyb
the boat is in storage right now.if your really interested in streghtening your pylon i could take some shots of it.the angle iron crossmember kept coming loose.

chico
03-04-2005, 03:33 PM
Left side...
http://img121.exs.cx/img121/5715/dscf16831po.jpg


top view...
http://img121.exs.cx/img121/3568/dscf16853da.jpg


Tied into motormount
http://img121.exs.cx/img121/3530/dscf16871vl.jpg
http://img162.exs.cx/img162/4718/dscf16884ww.jpg

JohnnyB
03-05-2005, 01:18 PM
Chico,

Thanks for posting the pictures!!! I may start with re-taping the holes in the stringers. For the pieces that attach at the motor mounts, did you have to move the motor mounts away from the stringers to accommodate the flat stock underneath them, or is that gap there already?

Thanks again.

chico
03-05-2005, 05:56 PM
johnnyb\
the gap is already there.if it is too big you can shim it.my pylon hasn,t budged in 2 years.

Jim@BAWS
03-05-2005, 08:29 PM
As a Dealer this would be a GREAT SALES TOOL. Nothing to hide in a MC Try doing what you are doing in a BU. Heck it probably would have come out of the boat already. Pictures are worth a 1000 words In the case of a MasterCraft 1000s of dollars

Jim@BAWS

chico
03-06-2005, 07:29 AM
jim
what,s a bu?

Laurel_Lake_Skier
03-06-2005, 03:27 PM
Short for Malibu......

lakes Rick
03-06-2005, 04:44 PM
Just for your info..

The nylon lock nuts are designed to be used only once. If you have backed them off they need to be replaced....