Like Tree0Likes

502 engine problems

Reply
Old 08-27-2011, 12:12 PM
  #1
Registered
Thread Starter
 
Join Date: Aug 2011
Posts: 3
Default 502 engine problems

have a 502 with 550hp, watercooled headers had broken exhaust valve on rear cylinder#8 new piston new valve every thing checked out at motor shop, put back in water ran for ten min broke exaust valve rear cylinder other side now bad piston and head I am afraid to fix again could their be a problem I am not aware of could water be getting into exaust port from my headers to snap a hot valve. iron eagle heads mot built at motor shop please help.
24challenger is offline  
Reply With Quote
Old 08-27-2011, 12:27 PM
  #2
Registered
 
Join Date: May 2010
Posts: 638
Default

Do you have cmi's? You are new here and the problem with them is pretty well known. You need to pressure check your headers. Mine got a crack and broke a valve. Not fun especially since it was scheduled for a check up the next day. If you have a leak go to a manifold style set up and be worry free.
GTOFFSHORE is offline  
Reply With Quote
Old 08-27-2011, 06:16 PM
  #3
Registered
Thread Starter
 
Join Date: Aug 2011
Posts: 3
Default 502 bad valves

thanks dont know what style headers I have, big black ones on the bottom there are waterline hoses that go to the thermostat area, dont know much about howthey work, there off the boat I will take a better look at them. does the water actually mix with the exaust or is it seprate in the header
24challenger is offline  
Reply With Quote
Old 08-27-2011, 09:11 PM
  #4
Registered
 
AIR TIME's Avatar
 
Join Date: Dec 2000
Location: EASTON MA.
My Boats: BAJA OL 650HP/ SABER 28 Gellner unlimited with konrad ace
Posts: 6,281
Default

Quote:
Originally Posted by 24challenger View Post
thanks dont know what style headers I have, big black ones on the bottom there are waterline hoses that go to the thermostat area, dont know much about howthey work, there off the boat I will take a better look at them. does the water actually mix with the exaust or is it seprate in the header
1st take pics of them and either join here as a paying member or put the pics on a picture site I think its called maybe someone can explain better than me on pics. if you find out they are leaking call DIAMOND PERFORMANCE MARINE =Bill at 302 521 0123 Bill has the best prices around for anything marine he carrys hardin marine exhaust which has 3 different headers plus the gil marine exhaust plus he has CMI headers and stainless marine exhaust which has lasted me 13years. but now I have hardin hurricane headers on my new boat which are nice. the stainless marine are manifolds and ss tubes in 4''/ 4 1/2'' /and 5''. hardin has real fancy headers all polished and seem to hold up nice. cmi headers have had issues my friends needed to be rewelded after 4years his standard ones another just blew up his turbo motor cause of leaking cmi headers and these were the split tops not 525 ones. so get us pic please if there black steel they might be lightning headers. but call bill I would not buy used headers but would buy used manifold style exhaust like SM. I did back in 1994 they were 6months old still work on my 509 650hp.
AIR TIME is offline  
Reply With Quote
Old 08-28-2011, 03:30 PM
  #5
Registered
Thread Starter
 
Join Date: Aug 2011
Posts: 3
Default bad valves

thank you everyone for you input new to this chat thing going to be come a paid member. Lots of differnt sugestions on my breaking exaust valves from bad headers to bad valves, was told only exaust valve to use would a inganol valve 100 a piece the valves I have are a 30 dollar valve any sugestions on this mess i have
24challenger is offline  
Reply With Quote
Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 09:01 PM.


Copyright 2011 OffShoreOnly. All rights reserved.