Lifters or Exhaust
Thread Starter
|
Junior User
Joined: Nov 2005
Posts: 73
Likes: 0
Lifters or Exhaust
Have been reading with interest the different threads on engine noise, specifically lifter rattle. Basically I have the same problem as everyone else, that is, engine knocks or rattles under load but is quiet at idle or down a hill. Everyone basically answers that it's usually an exhaust leak cos a lifter will rattle continually. Yet, I have spent the last 3 days trying to find an exhaust leak and there's none to be found. Knock is definitely metallic in sound and sounds like it's coming from tappets. Engine is 92 or 94 302W roller cam. Am about to go and buy a set of lifters out of sheer desperation. Would appreciate any opinions from anyone who's had the same yet managed to fix it.
Cheers
monarokid
Cheers
monarokid
Fleet Mechanic
Joined: Nov 2004
Posts: 1,324
Likes: 4
From: Michigan
If it knocks or rattles under load it may be preignition. Try using higher grade gas and see if you have the knocking. I have this on my 95 302 and it gets bad while towing. I believe it's carbon build up on the pistons. Some things you've just got to live with.
Elder User
Joined: Nov 2005
Posts: 523
Likes: 0
From: Murfreesboro, Tennessee
If its the nastycarbon build up get yourself some sea foam and run her through there. Is the truck a daily driver? If you have the time and the ability I would check the lifters before buying and saying thats the problem. I had the problem with my 351 It ended up being a roasted lifter from no oil getting in there. How dont know but it happend.
Laughing Gas
Joined: Jan 2005
Posts: 834
Likes: 0
From: South East Florida
i have a question about lifters. can these just be purchased and replaced as a maintenance? are brand new ones better than 12 yr old ones in my trucks case)?
would this have any kind of performance effect? are there any like super duper lifters that will give me 100 hp like stickers do for ricers? lol ok so it was more than one question
would this have any kind of performance effect? are there any like super duper lifters that will give me 100 hp like stickers do for ricers? lol ok so it was more than one question
Thread Starter
|
Junior User
Joined: Nov 2005
Posts: 73
Likes: 0
It's definitely not a timing or pre ignition problem. Timing is set as per specifications, and motor knocks whatever fuel I use. No exhaust leak so it has to be mechanical. Sounds like tappet rattle but ther're non adjustable so it would have to be a lifter or a valve spring right ? right ? Tell me I'm not crazy !
Keep the rubber side down !
monarokid
Keep the rubber side down !
monarokid
Fleet Mechanic
Joined: May 2004
Posts: 1,436
Likes: 0
From: Montana
Whell the fuel injection makes a clacking sound naturally.....ime makes a small ticking throught the fuel injection and my manifolds are forever coming loose. Did you check the manifold bolts? Passenger side rear?
Trending Topics
Thread Starter
|
Junior User
Joined: Nov 2005
Posts: 73
Likes: 0
Turns out the knocking is coming from either the gudgeon pins or it's piston slap. Mechanic used to race the 302W motors years ago and when he heard the noise he recognised it straight away. Now all I have to do is get the engine supplier to honour the warranty !
Thanks
monarokid
Thanks
monarokid
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Postmaster
Joined: Aug 2004
Posts: 2,908
Likes: 2
From: West Mansfield, Ohio
Nothing against your mechanic, but sometimes just listening to an engine is not going to determine the problem. These trucks were known for having cracked exhaust manifolds. And no matter how hard you tried, you COULD NOT find a leak, unless you took them off and found a crack.
With you saying it only does it under load, this leaves me to believe it could be pinging. And sometimes, 93 octane gas still won't take it away. Have you tried to use higher octane fuel and then retard the timing a little? I wouldn't bank on it being a toasted engine just yet.
With you saying it only does it under load, this leaves me to believe it could be pinging. And sometimes, 93 octane gas still won't take it away. Have you tried to use higher octane fuel and then retard the timing a little? I wouldn't bank on it being a toasted engine just yet.
Thread Starter
|
Junior User
Joined: Nov 2005
Posts: 73
Likes: 0
Timing is set as per handbook. 10 deg BTDC with shorting bar removed. Fuel is 98 octane unleaded WITH octane booster. Still does it. Cannot find an exhaust leak anywhere. Doesn't sound like pinging as that's what the old motor used to do so I'm quite used to what that sounds like. It's definitely a metal on metal sound. Bloody fords ! My next car will be a Goggomobile.LOL
monarokid
monarokid
Mountain Pass
Joined: Aug 2005
Posts: 140
Likes: 1
From: Seattle
The problem probably is one of the above mentioned items; However, I experienced something similiar to this on a non ford passenger car. My car had a rather loud ticking sound when it was idling and while under load. After looking closely and listening we were convinced that the sound was coming from the value train. So, I took it to a mechanic and after listening to it for about 20 seconds told me it was the belts. I told him he was full of it, no way could the belt make that kind of sound. He proceded to take a bottle of soapy water and spray the belt and the sound went away almost instantly. I couldn't believe it. Just goes to show you can never be to sure.
Moderator
Joined: Jun 2003
Posts: 3,539
Likes: 67
From: Calhoun GA
Originally Posted by handyman43358
Nothing against your mechanic, but sometimes just listening to an engine is not going to determine the problem. These trucks were known for having cracked exhaust manifolds. And no matter how hard you tried, you COULD NOT find a leak, unless you took them off and found a crack...
In my experience, angry lifter will always be noisy...loaded or not. An exhaust leak gets louder as the load increases. I've run into the same problem on my trucks, and all of them have been an exhaust leak of some kind.