Replacing Hatches. Transcend, Raven 31. Owners Clem Guildford & Lynda Hull
Reason, Generally replaced because they are leaking or the latches and supports have failed and cannot be replaced or the clears are now crackled scratched etc.
Replacement, We replaced our hatches with product from Curle hatches. The reason for this is that Curle make hatches that match exactly the size and radius of the original. The original owner, Clive Brown, was previously involved with Weaver hatches who are also known as Maxwell hatches. Curle is now owned by Tenob the manufacture of boat holder systems
The radius is important because if this does not match you have to modify the opening a time consuming job. Curle can custom make hatches to any size or radius. They generally carry stock of the hatch sizes commonly used on all Ravens.
Removing hatch, They generally have a bolt and nut around the perimeter with a flange fitted inside to bolt to. Silicone is placed around the opening and the hatch bolted down. To remove undo all bolts then use my favourite tool the renovator saw to cut away the silicone. If you do not have one of these borrow or buy as it saves a lot of hard work. The Curle site have a step by step guide of another method under retrofitting which all should read before attempting to remove hatches.
The holes for the bolts should be drilled and the old holes filled. This last job is important as invariably it is the old bolt holes that become the point of a leak.
The pattern of the silicone is important so inspect the base of the hatch that will sit on the deck and have at least two parallel beads running around the perimeter of the hole WHERE the SURFACE of the hatch will sit.
Bolt the inside flange into place and tighten. Tighten firmly then back off a quarter to half a turn and leave for 24 hours before firmly tightening again. This will have the effect of compressing the silicone rather than displacing it by over tightening at this point.
Testing, Water test after allowing things to set. The most common places for the hatch to leak at this stage is around the screws. These can be further tightened or use liquid silicone around the uphill edges of the hatch. This liquid silicone will find any gaps and set taking care of the leak. Great for windows as well.