google earth engine - How to mask pixels in image collection?

I want to mask pixels based on the quality band information for image collection Landsat 5. this is a code but the image-collection is empty afterward. I would be thankful if anyone could help me.

var startDate = '1992-01-01'
var endDate =   '1993-01-01'

var cloudCover = 30
var collection1992 = ee.ImageCollection('LANDSAT/LT05/C01/T1_SR')
                        .filter(ee.Filter.eq('WRS_PATH', 170))
                        .filter(ee.Filter.eq('WRS_ROW', 32))
                        .filterDate(startDate,endDate)
                        .filterMetadata('CLOUD_COVER','less_than',cloudCover)
                        .sort('system:time_start')
// cloud mask 66,130
var collection1992_noclouds = collection1992.map(function(img) {
                var mask1 = img.select('pixel_qa').eq(66).eq(130)

                return img.UpdateMask(mask1)
                    })
Map.addLayer(collection1992_noclouds, {}, 'collection1992_noclouds')