Is 4 times a week to much?

You want to layoff the strength training when you are in race season.  Once or twice a week doing an all body workout is OK but isolating body parts and doing training/racing is a bit much and could lead to injury.  Maintain some of your strength training by doing it twice a week for now and when the racing season is over you can add back a day or two of strength training.  but you really have to choose speed vs size which is more important to you.

If you want gains in size the best exercizes are the ones which maximise the amount of muscles used e.g. Deadlifts, squats and pushups, 3 times a week is how much my bodybuilder friend trains, for gains you need time to allow your muscles to grow. Also be wary of doing isolationist weights they are not very helpful and could lead to injuries, i.e. squats are much more useful then those leg raises which isolate your quads.

But.....

If you are doing tris it is important to make a choice, some training may help but it needs to be specific to your needs, e.g. I am working on leg strength for cycling and upper body strength for swimming, this can generally be achieved by doing the said discpipline (hillsprints, pull bouyes, sprints etc). but weights can supplement this.

I agree with above poster, need to make a choice 

I agree with this. I'm no doctor, but this is what I've learned over a few years of triathlons...

Happy training!