Mercruiser 8.2 coolant cap size

[dmorris800]

Hi guys, trying to track down a small coolant leak. Do you know what size the coolant cap is (IE is it GM or ford size??) or what radiator test kit includes a mercruiser cap?

motor is a 2019 mercruiser 8.2L ECT

thanks,
Dave

 

[boatlessgirl]

Hi Dave,
Do you have your engine serial # handy?

 

[dmorris800]

Hi Dave,
Do you have your engine serial # handy?

2A671327

 

[boatlessgirl]

2A671327

Hi, OK I see it is a 2019 8.2L EC Horizon...very nice! We thought that was a Mercury block but according to their parts lookup it's a GM 502 V8. I've been on hold for 12 minutes now trying to confirm . If I hear differently I will post. We have a cap here and it measures 3 1/2 x 3 1/2 OD. I'm sorry we don't have any radiator test kits here and not sure where to point you for those .

 

[dmorris800]

No worries, I think it has a loose gasket somewhere not very accessible. Trying to find where is the tricky part.