harmonic balancer help
Tuned
Joined: Sep 2010
Posts: 485
Likes: 0
From: Boise Idaho
It has been a while since I have worked on either of those two engines but I believe the balancers are different. Timing marks are different for sure. To me it wouldn't be worth the risk just for that reason alone.
Tuned
Joined: Sep 2010
Posts: 485
Likes: 0
From: Boise Idaho
I know the water pump pulleys are the same because I used a 302 pump pulley for my 351m. The 302 pulley was smaller and cooled a little better. But all the pulleys should work. I think the crank pulleys share the same bolt pattern but I'm not positive. I have all those pulleys out in the garage somewhere so I can see if I can find them tomorrow and let you know. As far as mounts go the power steering pump mounts are different and will not bolt up. My 351m engine did not come with an alternator bracket and I think I used one off a 302 so it should work.
Thread Starter
|
Junior User
Joined: Apr 2010
Posts: 55
Likes: 0
so you are saying the 302 may be a bit smaller which let your engine run cooler. I'd appreciate it if you did look just to verify for me, the main one is the crank pulley b/c the alt. came with the pulley on it.
Trending Topics
Tuned
Joined: Sep 2010
Posts: 485
Likes: 0
From: Boise Idaho
Yes, I don't remember what kind of improvement on cooling the slightly smaller 302 water pump pulley made, but there was some. I figured any extra cooling wouldn't hurt. My 351m always ran a little warm and I know I could drive it around town in July after switching out the pulleys without it overheating. Engine eventually blew up but at least I got a few more miles of in town driving out of it.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Thread Starter
|
Junior User
Joined: Apr 2010
Posts: 55
Likes: 0
well that's weird how there's no difference that you can see but it ran cooler .. if there was a difference it would have to make the 302 smaller b/c my guess is the water pump was turning faster due to the smaller pulley but is that an extra strain that would wear it out quicker
Tuned
Joined: Sep 2010
Posts: 485
Likes: 0
From: Boise Idaho
Yes, the 302 pulley is a smaller diameter. By about 1/2" or less. I had a mechanical gauge hooked up but I can't remember the exact degree of drop that occurred. I know it did bring me back somewhere close to operating temperature, 190-200. As far as wear on the water pump goes I doubt spinning the pump a little faster would cause a problem unless the 302 pump was built to handle the extra rpm's, hence the smaller pulley. But who knows. That is my opinion, but the risk is yours. Good luck.
.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
There are several different types of 351W harmonic balancers, as it depends on the applications.
What year/vehicle is the 351W from?
351W: 1969/89 misc Ford/Merc Passenger Cars / 1975/96 Econoline / 1981/96 F150/350 & Bronco.
FoMoCo offered accessory single/double/triple/quadruple sheave outer pulleys. These bolt to the harmonic balancers and were used when installing P/S, A/C, Dual Belt Alternators and smog pumps.