95 tbird help, coolant in oil December 15, 2006, 01:56:07 PM Ok,, i have a friend who wants me to figure out what the problem is with the coolant in his oil. I looked and its reall muddy in the oil so i just want to know what is common with the 4.6L engine. Is this the year for the plastic intake or not?I have no compression numbers yet but i will check tomorrowcoolant is not hitting the groundsmokes real real baddoes overheatfans do come on and work properlyradiator is not cloggedNot sure if head(s) is cracked and not sure how to check without pullingJust getting a feel for what might be the issues here. Im looking at pulling the heads and the job itself is going to be new for me since i have not worked on this engine before with those long ass timing chains to the overhead cams.Im just curious if this problem leads to a common problem or desgin issue. Quote Selected
95 tbird help, coolant in oil Reply #1 – December 15, 2006, 02:24:46 PM Sounds like a cracked head and or head gasket to me? Happened to my friends 98 taurus. Quote Selected
95 tbird help, coolant in oil Reply #2 – December 15, 2006, 02:25:08 PM You may be right about the plastic intake... that's the only "design flaw" I can think of for the SOHC 4.6. Sure sounds like you've got a head or head gasket failure though. It's not as common on the 4.6 as we 3.8 owners expect but could happen and that one displays all the symptoms. I think I'd rule out the intake before tangling with the timing chains.If he's run it long with the oil looking like that it may be better (and probably easier) to swap in another engine. Quote Selected
95 tbird help, coolant in oil Reply #3 – December 15, 2006, 02:56:18 PM Check the intake first as it's easiest. After you do a compression check you'll know if it's the head gaskets. The only problem I know of with the early 4.6s is that they have a tendency to burn oil because of bad valve seals. Other than that they a pretty reliable. If I go to the wreakers I see lots of Taxis and Police Interceptors with over 250K on them. Quote Selected
95 tbird help, coolant in oil Reply #4 – December 15, 2006, 04:00:59 PM Quote from: thunderjet302;118500Check the intake first as it's easiest. .I did a visual on the intake since its wide open to see under it and around it. Since the spark plugs are along side the injectors and not the exhaust (odd ball place imho), does the typical compression tester work on these engines are is there and adpt i have to get.? Quote Selected
95 tbird help, coolant in oil Reply #5 – December 15, 2006, 04:03:43 PM I think the '96-'97 4.6 engines had the faulty composite intake. The common area for them to crack is right behind the alternator.I would say it has a blown headgasket. Everything points to it... Quote Selected
95 tbird help, coolant in oil Reply #6 – December 16, 2006, 06:43:17 PM on first inspection and removal of the intake,, the throttle body was saturated with water.I was thinking that the only thing that could cause this was a cracked head? forcing air back up into the intake/tb? ,,,but,,, it runs real good and no missing.so...observationswater in throttle body / air tube and pvc tubeplugs rusted and gooped upwhile rotating engine,, rust was coming out in dust form on all cylcompression numbers vary from 110-140 on both headsim thinking blown head gaskets and possibly cracked heads.anyone>? Quote Selected
95 tbird help, coolant in oil Reply #7 – December 16, 2006, 06:47:31 PM Quote from: cougarcragar;118511I think the '96-'97 4.6 engines had the faulty composite intake. The common area for them to crack is right behind the alternator.I would say it has a blown headgasket. Everything points to it...i see how that alt bolts on now,, pretty odd but works i guess. I can see how that design could cause a problem. Quote Selected
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