Adjust valve clearance?
Ridiculously Active Enthusiast
Joined: Dec 2010
Posts: 950
Re: Adjust valve clearance?
actually, it's 2AZ-FXE engine
The dual overhead camshafts are driven by a single-stage roller chain of 8.0 mm (0.3-in) pitch, enabling a narrow included valve angle of 27.5°. The camshafts act on four valves per cylinder via bucket tappets. As in the recent Toyota engine practice, no clearance adjusting shim is employed. Valve diameters are 34.0 mm (1.3 in) for intake and 29.5 mm (1.2 in) for exhaust, with 8.0 mm (0.3-in) lift for both intake and exhaust. The four-vane VVT-i device is fitted on the intake camshaft, altering timing by 50°. The valve cover is made of magnesium to save weight.
2AZ-FXE
The 2AZ-FXE is an Atkinson cycle variant of the 2AZ-FE. It has the same bore and stroke, but the cams and pistons are unique. It has a physical compression ratio of 12.5:1.
The large valve overlap leads to a reduction in cylinder charge and reduced torque and power output, but efficiency is increased. This combination makes the 2AZ-FXE suitable for use in hybrid vehicles, where peak torque and power demands can be met by the electric motor and battery.
Maximum output when used in the Camry hybrid is 147 hp (108 kW) at 6000 rpm with 138 lb·ft (187 N·m) of torque at 4400 rpm.
Applications:
Toyota Alphard Hybrid
Toyota Estima Hybrid
2007–2010 Toyota Camry Hybrid ACV40
2011 Toyota Camry Hybrid AVV50
And yes, we are screwed:
Along with the increased amount of valve lift, shimless valve lifters that provide a large cam contact
surface are used. The adjustment of the valve clearance is accomplished by selecting and replacing the
appropriate valve lifters.
Service Tip
The valve lifters are available in 35 size in increment of 0.020 mm (0.008 in.), from 5.060 mm (0.199
in.) to 5.740 mm (0.226 in.). For details, refer to the 2007 Camry Hybrid Vehicle Repair Manual (Pub.
No. RM02H0U).
As those lifters are not hydraulic type. They are simply "buckets" sitting in upside down position on top of the valve stems and valve springs. Which renders you incapable of DIY those. We had 94 shimmable Corolla, adjusting clearance was a $500 job to be done by a pro shop only. I can only imagine how much it''ll cost on TCH.
No, no. Back to Hondas.
The dual overhead camshafts are driven by a single-stage roller chain of 8.0 mm (0.3-in) pitch, enabling a narrow included valve angle of 27.5°. The camshafts act on four valves per cylinder via bucket tappets. As in the recent Toyota engine practice, no clearance adjusting shim is employed. Valve diameters are 34.0 mm (1.3 in) for intake and 29.5 mm (1.2 in) for exhaust, with 8.0 mm (0.3-in) lift for both intake and exhaust. The four-vane VVT-i device is fitted on the intake camshaft, altering timing by 50°. The valve cover is made of magnesium to save weight.
2AZ-FXE
The 2AZ-FXE is an Atkinson cycle variant of the 2AZ-FE. It has the same bore and stroke, but the cams and pistons are unique. It has a physical compression ratio of 12.5:1.
The large valve overlap leads to a reduction in cylinder charge and reduced torque and power output, but efficiency is increased. This combination makes the 2AZ-FXE suitable for use in hybrid vehicles, where peak torque and power demands can be met by the electric motor and battery.
Maximum output when used in the Camry hybrid is 147 hp (108 kW) at 6000 rpm with 138 lb·ft (187 N·m) of torque at 4400 rpm.
Applications:
Toyota Alphard Hybrid
Toyota Estima Hybrid
2007–2010 Toyota Camry Hybrid ACV40
2011 Toyota Camry Hybrid AVV50
And yes, we are screwed:
Along with the increased amount of valve lift, shimless valve lifters that provide a large cam contact
surface are used. The adjustment of the valve clearance is accomplished by selecting and replacing the
appropriate valve lifters.
Service Tip
The valve lifters are available in 35 size in increment of 0.020 mm (0.008 in.), from 5.060 mm (0.199
in.) to 5.740 mm (0.226 in.). For details, refer to the 2007 Camry Hybrid Vehicle Repair Manual (Pub.
No. RM02H0U).
As those lifters are not hydraulic type. They are simply "buckets" sitting in upside down position on top of the valve stems and valve springs. Which renders you incapable of DIY those. We had 94 shimmable Corolla, adjusting clearance was a $500 job to be done by a pro shop only. I can only imagine how much it''ll cost on TCH.
No, no. Back to Hondas.
Last edited by ukrkoz; Aug 5, 2012 at 01:08 PM.
Pretty Darn Active Enthusiast
Joined: Mar 2008
Posts: 281
From: Jacksonville, FL
Re: Adjust valve clearance?
There are 4 sources of valve clearance changes in this engine design:
1. Wear of the tappet surface. As long as the lubricant is appropriate quality, this should be negligible for the life of the engine. This will tend to increase the clearance.
2. Valve seat recession, or valve face wear. This will tend to decrease the clearance.
3. Machining of head, and valves. This is a head-overhaul issue, and you're in there on a pretty invasive way anyway.
4. Wear on the cam and cam bearings. This will cause a 'tick', but tappet clearance is the least of your issues here - the worn cam lobes will need replacing anyway.
The design is pretty durable and maintenance-free. It's biggest downside is relatively high frictional loads - and this is relative to a roller follower design. With high valve spring tension it also can have a (small) tendency to gall - but that's using springs substantially stiffer than stock. This can also be an issue if the valve sticks in the guide.
As to DIY-friendly - the process is to measure clearances, figure the replacement you need, and it's a bit of a chore, likely best done with head out of the car. Were it a requirement to do such a procedure at 30K mile intervals, I'd agree it would be a major negative - but with decent oil and care, the adjustment should be good for life of the valves.
1. Wear of the tappet surface. As long as the lubricant is appropriate quality, this should be negligible for the life of the engine. This will tend to increase the clearance.
2. Valve seat recession, or valve face wear. This will tend to decrease the clearance.
3. Machining of head, and valves. This is a head-overhaul issue, and you're in there on a pretty invasive way anyway.
4. Wear on the cam and cam bearings. This will cause a 'tick', but tappet clearance is the least of your issues here - the worn cam lobes will need replacing anyway.
The design is pretty durable and maintenance-free. It's biggest downside is relatively high frictional loads - and this is relative to a roller follower design. With high valve spring tension it also can have a (small) tendency to gall - but that's using springs substantially stiffer than stock. This can also be an issue if the valve sticks in the guide.
As to DIY-friendly - the process is to measure clearances, figure the replacement you need, and it's a bit of a chore, likely best done with head out of the car. Were it a requirement to do such a procedure at 30K mile intervals, I'd agree it would be a major negative - but with decent oil and care, the adjustment should be good for life of the valves.
Ridiculously Active Enthusiast
Joined: Dec 2010
Posts: 950
Re: Adjust valve clearance?
Yeah, but I had frank discussion with techs that were supposed to do shims for that 94 Corolla. Which is same principle here, just with buckets.
You have to buy entire iffing set of those, as you have to do one at a time, and may end up using various sizes. Hence the costs. Of course, they might have been putting yarn in my ears, but I am tech savvy enough and asked straight questions to sorta trust them on this. Small family owned Toyota specialty shop.
Like I said - Hondas. Still hand adjustable with screw.
You have to buy entire iffing set of those, as you have to do one at a time, and may end up using various sizes. Hence the costs. Of course, they might have been putting yarn in my ears, but I am tech savvy enough and asked straight questions to sorta trust them on this. Small family owned Toyota specialty shop.
Like I said - Hondas. Still hand adjustable with screw.
Super Moderator
Joined: Nov 2007
Posts: 1,261
From: NW Georgia
Re: Adjust valve clearance?
automatically adjusted with hydraulic lasher adjusters.
why do you need to adjust them? if you have persistent clicking noise, tapping, as in rockers noise, run Seafoam through crankcase, to clean lashers.........Those are called Beck Arnley Valve Lifters. Claimed to fit Hybrid Camry. Run $16 plus shipping a pop online.
why do you need to adjust them? if you have persistent clicking noise, tapping, as in rockers noise, run Seafoam through crankcase, to clean lashers.........Those are called Beck Arnley Valve Lifters. Claimed to fit Hybrid Camry. Run $16 plus shipping a pop online.
Beck Arnley is a company that makes a LOT of auto parts including valve lifters. They are also made by a bunch of other companies but they are still called valve lifters, not Beck Arnley valve lifters.
Ridiculously Active Enthusiast
Joined: Dec 2010
Posts: 950
Re: Adjust valve clearance?
Not sure. I started with searching for Camry Hybrid lifters, that brought me to BA lifters, then I searched Google for BA lifters, and that cross referenced to Toyota lifters right away.
Re: Adjust valve clearance?
those lifters are $16-17 a piece on your local toyota dealership and you don't buy the whole set (35 sizes)
the parts guy will ask for your vin and what sizes and how many you need. anybody who knows how to replace a timing chain or belt or replaced a head gasket can tackle this job as a DIY.
the parts guy will ask for your vin and what sizes and how many you need. anybody who knows how to replace a timing chain or belt or replaced a head gasket can tackle this job as a DIY.
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