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How to replace oil check valves?

Posted: Fri Feb 16, 2018 4:21 am
by sportston
Does anyone know how to change the common GT oil check valves safely please. Is there a link or video on this topic?

Re: How to replace oil check valves?

Posted: Fri Feb 16, 2018 6:42 am
by Craig380
There was an article in Classic Mechanics about doing this, the problem is glueing the oil lines, a special adhesive is needed because of the oil line material.

Have a look here: https://www.oldjapanesebikes.com/blog/2 ... ion-lines/" onclick="window.open(this.href);return false;

Re: How to replace oil check valves?

Posted: Fri Feb 16, 2018 5:51 pm
by joethebike
If you look at this eBay seller of new check valves he details a removal/refit process: https://www.ebay.com.au/itm/Suzuki-GT75 ... xy63FSnMu9" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;

Been having some troubles with air in my right T350 oil lines and my third and last right oil line spare seems to be working OK however, refitting new check valves into the old oil lines looks a bit intimidating.

Re: How to replace oil check valves?

Posted: Fri Feb 16, 2018 5:57 pm
by old racer
Just don't buy those check valves.

Re: How to replace oil check valves?

Posted: Sat Feb 17, 2018 5:42 am
by joethebike
I pulled out one of the T350 check valves today and noted they are different to the GT750 valves pictured in old posts on the subject. The GT750 valves have the spring and ball inserted into the oil line end of the brass body while the T350 valve's brass body only has a 2mm hole in the oil line end and the spring and ball are somehow enclosed within the body of the brass valve.
How do they get the spring and ball into what seems like a formed in one piece brass body?

Re: How to replace oil check valves?

Posted: Sat Feb 17, 2018 9:51 am
by tz375
Joe, I think that GT750s are the same. There is an end cap that holds the spring and ball in place but it's hard to spot. The end that the nylon feed line fits over can be removed with a pair of pliers. Twist it and it should come loose.

Re: How to replace oil check valves?

Posted: Sat Feb 17, 2018 3:28 pm
by joethebike
I see what you mean about the end cap, my old eyes thought it was all one piece.

Re: How to replace oil check valves?

Posted: Sun Feb 18, 2018 10:16 am
by johnakay
heard that Kawasaki triple check valve will fit and can still get them.

Re: How to replace oil check valves?

Posted: Sun Feb 18, 2018 11:06 am
by sportston
Thank you. It didn't have the info I was looking for. I wanted to know how to remove and replace the banjos without damaging the pipes. I worked it out in the end, but not before damaging two pipes which I have now repaired.
The technique that worked is to heat the ends up with a hair drier and wiggle the plastic ends off using a pair of pliers and a sideways wiggling movement. Just pulling them straight back will almost certainly end up with the pliers slipping off and snapping the pipe.

Re: How to replace oil check valves?

Posted: Mon Feb 19, 2018 4:58 pm
by tricky1962
old racer wrote:Just don't buy those check valves.
I bought those check valves before 2015 (that's as far as my ebay history goes so can't be more definitive)

I do about 4000 miles a year so we are looking at 12000 mile+ on those valves.

I have had no problems

I have no connection with that company/dealer

I dislike slagging off someone without backing up the slagging with facts, some come on, what's your experience with their product?

Another forum I frequent has a no name no shame policy, maybe this one should too

Re: How to replace oil check valves?

Posted: Wed Feb 21, 2018 3:03 pm
by sportston
I fitted the new Kawasaki ones. Hopefully they will be ok.