Timing belt or chain....03 Honda CRV 2.4 L

[Win]

Originally Posted By: bdcardinal
Originally Posted By: rationull
Originally Posted By: OVERK1LL
Which Ford engines have the "shim over bucket" style? The Modular engines use hydraulic lash adjusters with roller followers.....


Sorry, should've specified I was talking about the Duratec 20/23 (whether you want to refer to that as a Ford engine or a Mazda one is certainly debatable). I didn't mean to imply that *all* engines from the manufacturers I listed used mechanical tappets -- I don't think that holds true for Nissan or Toyota either.


the 3.9L V8 in the Lincoln LS and latest generation T-bird uses the shim over bucket design.


Because the 3.9 is / was a decontented Jaguar AJ-V8. Jaguar has always used shim over bucket AFAIK.

On the old sixes, often just flipping the shim over would put them back in spec for another 150K miles or so.

 

[1999nick]

Originally Posted By: JohnBrowning
All my early Toyota's had manual adjusted cam followers or rockers. By the time I was in H.S. I could do all the valves on my Toyota 4 cylinders in under 18 minutes not counting how long it took to get it hot. So I do not see where the mechanical adjustment is that big of a deal 18 minutes ever 30,000 miles never seemed like much of a sacrifice to have the most accurate valve action and less unsprung mass! Hydraulic lifters and slack adjusters are sloppy and only thing they really do is pander to lazy people and those that are too incompetent to pick up a wrench and get it done! Etended Oil Changes are more of the same they mostly pander to fleets that want low initial cost of ownership number by keeping maintenance to a minimum....So while I do not pine away missing the good old days I do not see hydraulic lifters or slack adjusters as a huge selling point. That is right up their with the vanity mirror and lights on the passenger side of the car not a big selling point for me!

Now timing chain instead of a belt that is a big thing.....I hate timing belts and definately am not sad to see them go!


When I was in high school, those Toyota trucks were about twenty or twenty five years in the future. My high school ride was a 1940 Ford with the infamous V-8-60 engine. Imagine a flat head V-8 with 134 cubic inches. It would do about 70 mph wide open, and it gave about 27 mpg, which was excellent for the time (about 1952-53). It did not ever require a valve adjustment.

The only valve adjustment I ever had to have done was on my 1981 Honda Civic station wagon. I only kept it about 3 years, so I was never faced with the dreaded timing belt replacement.

My 1999 Nissan Maxima has hydraulic lifters, as does my 2005 Pathfinder. I would dread to see what an adjustment would cost, either in terms of money or time on that sideways V-6 in the Maxima. How fast could you adjust the valves on one of these? Plus, the cost of new valve cover gaskets, etc. Plus, mechanical valves never seem to be as quiet as the hydraulic kind. When was the accuracy of the hydraulic lifters ever a problem?

Now, to a more serious consideration: Lighted mirrors on the back of the front passenger's sunshade. If I ever had a vehicle without this feature, my wife would make me get an aftermarket replacement, which I have done in the past. Other features, in addition to hydraulic lifters, that I did without in the past but would not like to have to now include such items as automatic instead of hand choke, power steering, power brakes, tinted glass, power windows, power seats, heated rear windows, tubeless tires, and air conditioning.

I have been successfully doing extended oil changes since the advent of Mobil 1 synthetic back in the 70's. Many years back in my middle age days I had two cars and a truck, and I changed my own oil, as I still do. I didn't have time or inclination to change oil in 3 vehicles 3 or 4 times (each) a year. I don't consider that I was particularly lazy, as I was working 50 to 60 hours a week to raise and send to college 4 kids. No way would I want to be adjusting valves on my fleet, when it was absolutely unnecessary.

 

[OVERKILL]

Originally Posted By: chrome
Honda may maintain mechanically adjusted "screw and nut" lash adjustment due to their VTEC engagement philosophy and design. Adding a hydraulic lash mechanism could be an unnecessary complexity which may detract from long term reliability.

Hydraulic lifters are nice when everything works. But dirty oil, sludging etc usually leads to collapsed lifters which is detrimental to engine operation. Some engines won't even start or idle properly with one or more collapsed lifters.


I've never had a hydraulic lifter fail on anything I've ever owned.

The last engine we owned that had solid lifters looked like this:

And it was fitted in a 1931 Chris-Craft.